diff --git a/internal/contract/letter_outgoing_contract.go b/internal/contract/letter_outgoing_contract.go
index 8317247..00f5bf7 100644
--- a/internal/contract/letter_outgoing_contract.go
+++ b/internal/contract/letter_outgoing_contract.go
@@ -55,6 +55,7 @@ type CreateOutgoingLetterRequest struct {
 	IssueDate             time.Time                        `json:"issue_date" validate:"required"`
 	Attachments           []CreateOutgoingLetterAttachment `json:"attachments,omitempty"`
 	UserID                uuid.UUID
+	ApprovalFlowID 		  *uuid.UUID                       `json:"approval_flow_id,omitempty"`
 }
 
 type OutgoingLetterRecipientResponse struct {
diff --git a/internal/service/letter_outgoing_service.go b/internal/service/letter_outgoing_service.go
index a49a5e4..c964a16 100644
--- a/internal/service/letter_outgoing_service.go
+++ b/internal/service/letter_outgoing_service.go
@@ -103,6 +103,7 @@ func (s *LetterOutgoingServiceImpl) CreateOutgoingLetter(ctx context.Context, re
 		ReceiverName:          req.ReceiverName,
 		IssueDate:             req.IssueDate,
 		CreatedBy:             userID,
+		ApprovalFlowID:        req.ApprovalFlowID,
 	}
 
 	if req.ReferenceNumber != nil {