diff --git a/internal/use-case/main-use-case/unit-position/case.go b/internal/use-case/main-use-case/unit-position/case.go
index 47ea67cd..c472e90c 100644
--- a/internal/use-case/main-use-case/unit-position/case.go
+++ b/internal/use-case/main-use-case/unit-position/case.go
@@ -290,7 +290,7 @@ func Delete(input e.DeleteDto) (*d.Data, error) {
 
 func validateForeignKey(input e.CreateDto) error {
 	// validate installation_id
-	if _, err := uu.ReadDetail(eu.ReadDetailDto{Code: &input.Code}); err != nil {
+	if _, err := uu.ReadDetail(eu.ReadDetailDto{Code: input.Unit_Code}); err != nil {
 		return err
 	}