Feat[BE]: refactor document handling in transfer service and introduce document type constants

internal/utils/constant.go

@@ -314,6 +314,19 @@ var ExpenseApprovalSteps = map[approvalutils.ApprovalStep]string{
 	ExpenseStepSelesai:   "Selesai",
 }
 
+// -------------------------------------------------------------------
+// Document
+// -------------------------------------------------------------------
+
+type DocumentType string
+type DocumentableType string
+
+const (
+	DocumentTypeTransfer DocumentType = "STOCK_TRANSFER_DOCUMENT"
+
+	DocumentableTypeTransfer DocumentableType = "STOCK_TRANSFER"
+)
+
 // -------------------------------------------------------------------
 // Validators
 // -------------------------------------------------------------------
@@ -448,7 +461,7 @@ func IsValidExpenseCategory(v string) bool {
 	return false
 }
 
-// example use
+// e    xample use
 
 // Recording helper