SAP Condition Records Internal Error VK067
Internal error VK067 occurs when you try to create condition records when there is inconsistency in condition table
SD
BAPI_AGREEMENTS : BAPI to Create Agreements in SAP
Use BAPI BAPI_AGREEMENTS to create agreements in SAP
Use of SY-TCODE in Delivery Processing User-Exits
Have you ever tried to switch between display mode and change mode of the delivery using user-exits?