diff --git a/cmd/main-migration/migrations/20251111073546.sql b/cmd/main-migration/migrations/20251111073546.sql
new file mode 100644
index 00000000..dd99dc74
--- /dev/null
+++ b/cmd/main-migration/migrations/20251111073546.sql
@@ -0,0 +1,12 @@
+-- Drop index "idx_order_src" from table: "McuOrderItem"
+DROP INDEX "public"."idx_order_src";
+-- Modify "McuOrderItem" table
+ALTER TABLE "public"."McuOrderItem" DROP CONSTRAINT "fk_McuOrderItem_McuSrc", DROP COLUMN "McuSrc_Id", ALTER COLUMN "McuSrc_Code" TYPE character varying(20), ADD CONSTRAINT "fk_McuOrderItem_McuSrc" FOREIGN KEY ("McuSrc_Code") REFERENCES "public"."McuSrc" ("Code") ON UPDATE NO ACTION ON DELETE NO ACTION;
+-- Create index "idx_order_src" to table: "McuOrderItem"
+CREATE UNIQUE INDEX "idx_order_src" ON "public"."McuOrderItem" ("McuOrder_Id", "McuSrc_Code");
+-- Drop index "idx_order_sub_src" from table: "McuOrderSubItem"
+DROP INDEX "public"."idx_order_sub_src";
+-- Modify "McuOrderSubItem" table
+ALTER TABLE "public"."McuOrderSubItem" DROP CONSTRAINT "fk_McuOrderSubItem_McuSubSrc", DROP COLUMN "McuSubSrc_Id", ALTER COLUMN "McuSubSrc_Code" TYPE character varying(20), ADD CONSTRAINT "fk_McuOrderSubItem_McuSubSrc" FOREIGN KEY ("McuSubSrc_Code") REFERENCES "public"."McuSubSrc" ("Code") ON UPDATE NO ACTION ON DELETE NO ACTION;
+-- Create index "idx_order_sub_src" to table: "McuOrderSubItem"
+CREATE UNIQUE INDEX "idx_order_sub_src" ON "public"."McuOrderSubItem" ("McuSubSrc_Code", "McuOrderItem_Id");
diff --git a/cmd/main-migration/migrations/atlas.sum b/cmd/main-migration/migrations/atlas.sum
index e43196ac..1e4fb9ef 100644
--- a/cmd/main-migration/migrations/atlas.sum
+++ b/cmd/main-migration/migrations/atlas.sum
@@ -1,4 +1,4 @@
-h1:vasJP/oxpmBaTqzDjsVao7o+/VZL6cw5bigh2fFk1+Q=
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 20250904105930.sql h1:MEM6blCgke9DzWQSTnLzasbPIrcHssNNrJqZpSkEo6k=
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 20250908062237.sql h1:Pu23yEW/aKkwozHoOuROvHS/GK4ngARJGdO7FB7HZuI=
@@ -75,37 +75,38 @@ h1:vasJP/oxpmBaTqzDjsVao7o+/VZL6cw5bigh2fFk1+Q=
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diff --git a/internal/domain/main-entities/mcu-order-item/dto.go b/internal/domain/main-entities/mcu-order-item/dto.go
index 75e02184..6880c9b7 100644
--- a/internal/domain/main-entities/mcu-order-item/dto.go
+++ b/internal/domain/main-entities/mcu-order-item/dto.go
@@ -10,7 +10,7 @@ import (
 
 type CreateDto struct {
 	McuOrder_Id     *uint              `json:"mcuOrder_id"`
-	McuSrc_Id       *uint              `json:"mcuSrc_id"`
+	McuSrc_Code     *string            `json:"mcuSrc_code"`
 	Result          *string            `json:"result"`
 	Status_Code     erc.DataStatusCode `json:"status_code"`
 	ExaminationDate *time.Time         `json:"examinationDate"`
@@ -24,7 +24,7 @@ type ReadListDto struct {
 
 type FilterDto struct {
 	McuOrder_Id *uint              `json:"mcu-order-id"`
-	McuSrc_Id   *uint              `json:"mcu-src-id"`
+	McuSrc_Code *string            `json:"mcu-src-code"`
 	Result      *string            `json:"result"`
 	Status_Code erc.DataStatusCode `json:"status-code"`
 }
@@ -56,7 +56,7 @@ type ResponseDto struct {
 	ecore.Main
 	McuOrder_Id     *uint              `json:"mcuOrder_id"`
 	McuOrder        *emo.McuOrder      `json:"mcuOrder,omitempty"`
-	McuSrc_Id       *uint              `json:"mcuSrc_id"`
+	McuSrc_Code     *string            `json:"mcuSrc_code"`
 	McuSrc          *ems.McuSrc        `json:"mcuSrc,omitempty"`
 	Result          *string            `json:"result"`
 	Status_Code     erc.DataStatusCode `json:"status_code"`
@@ -67,7 +67,7 @@ func (d McuOrderItem) ToResponse() ResponseDto {
 	resp := ResponseDto{
 		McuOrder_Id:     d.McuOrder_Id,
 		McuOrder:        d.McuOrder,
-		McuSrc_Id:       d.McuSrc_Id,
+		McuSrc_Code:     d.McuSrc_Code,
 		McuSrc:          d.McuSrc,
 		Result:          d.Result,
 		Status_Code:     d.Status_Code,
diff --git a/internal/domain/main-entities/mcu-order-item/entity.go b/internal/domain/main-entities/mcu-order-item/entity.go
index 56687046..97384243 100644
--- a/internal/domain/main-entities/mcu-order-item/entity.go
+++ b/internal/domain/main-entities/mcu-order-item/entity.go
@@ -13,9 +13,8 @@ type McuOrderItem struct {
 	ecore.Main                         // adjust this according to the needs
 	McuOrder_Id     *uint              `json:"mcuOrder_id" gorm:"uniqueIndex:idx_order_src"`
 	McuOrder        *emo.McuOrder      `json:"mcuOrder,omitempty" gorm:"foreignKey:McuOrder_Id;references:Id"`
-	McuSrc_Id       *uint              `json:"mcuSrc_id" gorm:"uniqueIndex:idx_order_src"`
 	McuSrc_Code     *string            `json:"mcuSrc_code" gorm:"uniqueIndex:idx_order_src"`
-	McuSrc          *ems.McuSrc        `json:"mcuSrc,omitempty" gorm:"foreignKey:McuSrc_Id;references:Id"`
+	McuSrc          *ems.McuSrc        `json:"mcuSrc,omitempty" gorm:"foreignKey:McuSrc_Code;references:Code"`
 	ExaminationDate *time.Time         `json:"examinationDate"`
 	Result          *string            `json:"result"`
 	Status_Code     erc.DataStatusCode `json:"status_code"`
diff --git a/internal/domain/main-entities/mcu-order-sub-item/dto.go b/internal/domain/main-entities/mcu-order-sub-item/dto.go
index 615b0ee9..a85d14e7 100644
--- a/internal/domain/main-entities/mcu-order-sub-item/dto.go
+++ b/internal/domain/main-entities/mcu-order-sub-item/dto.go
@@ -8,7 +8,7 @@ import (
 )
 
 type CreateDto struct {
-	McuSubSrc_Id    *uint              `json:"mcuSubSrc_id"`
+	McuSubSrc_Code  *string            `json:"mcuSubSrc_code"`
 	McuOrderItem_Id *uint              `json:"mcuOrderItem_id"`
 	Result          *string            `json:"result"`
 	Status_Code     erc.DataStatusCode `json:"status_code"`
@@ -22,7 +22,7 @@ type ReadListDto struct {
 
 type FilterDto struct {
 	McuOrder_Id *uint              `json:"mcuOrder-id"`
-	McuSrc_Id   *uint              `json:"mcuSrc-id"`
+	McuSrc_Code *string            `json:"mcuSrc-code"`
 	Result      *string            `json:"result"`
 	Status_Code erc.DataStatusCode `json:"status-code"`
 }
@@ -47,7 +47,7 @@ type MetaDto struct {
 
 type ResponseDto struct {
 	ecore.Main
-	McuSubSrc_Id    *uint              `json:"mcuSubSrc_id"`
+	McuSubSrc_Code  *string            `json:"mcuSubSrc_code"`
 	McuSubSrc       *emss.McuSubSrc    `json:"mcuSubSrc,omitempty"`
 	McuOrderItem_Id *uint              `json:"mcuOrderItem_id"`
 	McuOrderItem    *emoi.McuOrderItem `json:"mcuOrderItem,omitempty"`
@@ -57,7 +57,7 @@ type ResponseDto struct {
 
 func (d McuOrderSubItem) ToResponse() ResponseDto {
 	resp := ResponseDto{
-		McuSubSrc_Id:    d.McuSubSrc_Id,
+		McuSubSrc_Code:  d.McuSubSrc_Code,
 		McuSubSrc:       d.McuSubSrc,
 		McuOrderItem_Id: d.McuOrderItem_Id,
 		McuOrderItem:    d.McuOrderItem,
diff --git a/internal/domain/main-entities/mcu-order-sub-item/entity.go b/internal/domain/main-entities/mcu-order-sub-item/entity.go
index 5ae9463c..a9bde496 100644
--- a/internal/domain/main-entities/mcu-order-sub-item/entity.go
+++ b/internal/domain/main-entities/mcu-order-sub-item/entity.go
@@ -10,9 +10,8 @@ import (
 
 type McuOrderSubItem struct {
 	ecore.Main                         // adjust this according to the needs
-	McuSubSrc_Id    *uint              `json:"mcuSubSrc_id" gorm:"uniqueIndex:idx_order_sub_src"`
 	McuSubSrc_Code  *string            `json:"mcuSubSrc_code" gorm:"uniqueIndex:idx_order_sub_src"`
-	McuSubSrc       *emss.McuSubSrc    `json:"mcuSubSrc,omitempty" gorm:"foreignKey:McuSubSrc_Id;references:Id"`
+	McuSubSrc       *emss.McuSubSrc    `json:"mcuSubSrc,omitempty" gorm:"foreignKey:McuSubSrc_Code;references:Code"`
 	McuOrderItem_Id *uint              `json:"mcuOrderItem_id" gorm:"uniqueIndex:idx_order_sub_src"`
 	McuOrderItem    *emoi.McuOrderItem `json:"mcuOrderItem,omitempty" gorm:"foreignKey:McuOrderItem_Id;references:Id"`
 	Result          *string            `json:"result"`
diff --git a/internal/use-case/main-use-case/mcu-order-item/helper.go b/internal/use-case/main-use-case/mcu-order-item/helper.go
index a2694ecd..8c6e861e 100644
--- a/internal/use-case/main-use-case/mcu-order-item/helper.go
+++ b/internal/use-case/main-use-case/mcu-order-item/helper.go
@@ -18,7 +18,7 @@ func setData[T *e.CreateDto | *e.UpdateDto](input T, data *e.McuOrderItem) {
 	}
 
 	data.McuOrder_Id = inputSrc.McuOrder_Id
-	data.McuSrc_Id = inputSrc.McuSrc_Id
+	data.McuSrc_Code = inputSrc.McuSrc_Code
 	data.Result = inputSrc.Result
 	data.Status_Code = inputSrc.Status_Code
 	data.ExaminationDate = inputSrc.ExaminationDate
diff --git a/internal/use-case/main-use-case/mcu-order-item/lib.go b/internal/use-case/main-use-case/mcu-order-item/lib.go
index 4b5bb04f..015befea 100644
--- a/internal/use-case/main-use-case/mcu-order-item/lib.go
+++ b/internal/use-case/main-use-case/mcu-order-item/lib.go
@@ -24,7 +24,7 @@ func CreateData(input e.CreateDto, event *pl.Event, dbx ...*gorm.DB) (*e.McuOrde
 
 	deletedData := e.McuOrderItem{}
 	tx.Unscoped().
-		Where("\"McuOrder_Id\" = ? AND \"McuSrc_Id\" = ?", *input.McuOrder_Id, input.McuSrc_Id).
+		Where("\"McuOrder_Id\" = ? AND \"McuSrc_Code\" = ?", *input.McuOrder_Id, input.McuSrc_Code).
 		First(&deletedData)
 	if deletedData.Id != 0 {
 		if err := tx.Unscoped().Model(e.McuOrderItem{}).Where("\"Id\" = ?", deletedData.Id).Update("\"DeletedAt\"", nil).Error; err != nil {
diff --git a/internal/use-case/main-use-case/mcu-order-sub-item/helper.go b/internal/use-case/main-use-case/mcu-order-sub-item/helper.go
index f8d9c30f..d7e6ed20 100644
--- a/internal/use-case/main-use-case/mcu-order-sub-item/helper.go
+++ b/internal/use-case/main-use-case/mcu-order-sub-item/helper.go
@@ -17,7 +17,7 @@ func setData[T *e.CreateDto | *e.UpdateDto](input T, data *e.McuOrderSubItem) {
 		inputSrc = &inputTemp.CreateDto
 	}
 
-	data.McuSubSrc_Id = inputSrc.McuSubSrc_Id
+	data.McuSubSrc_Code = inputSrc.McuSubSrc_Code
 	data.McuOrderItem_Id = inputSrc.McuOrderItem_Id
 	data.Result = inputSrc.Result
 	data.Status_Code = inputSrc.Status_Code