Locking issue in WS_DELIVERY_UPDATE_2

Hi ,

We are using function module WS_DELIVERY_UPDATE_2 to do PGI of delivery but we are getting error message 'The requested object is locked by another transaction' , Description of error is as follows :

A lock requested by calling an ENQUEUE function module cannot be provided because the object in question has already been locked by its own transaction.

Technical Information: The C_ENQUEUE routine returns the following values:

COLLISION_OBJECT = ECSL_MTLK

COLLISION_UNAME = C332595KP

Any pointers to resolve this issue would be highly helpful .

Thanks in advance,

Kiran.