Delivery Locking after validating

I trying to validate my deliveries using the  VALIDATION() subprogram in the TRTVENLIVV file. 

Whenever, I successfully validate a delivery, the record is locked up. 

I added the Unlock = "SDH"+delivery_number command, but the record is still locked up. 

Anybody have any ideas? I am currently on version 11, patch 14. 

Call VALIDATION(SDHNUM) From TRTVENLIVV

Unlock = "SDH:"+SDHNUM

Thanks,

Chris