COMMIT WORK - performance problem

Question

Dear Fellow SDNers,
I seek your help on the following problem:
Scenario : Inbound idoc which updates an Outbound delivery with Picked quantity, posts the goods issue and then creates billing document
Approach : I am using the function module SD_DELIVERY_UPDATE_PICKING to update the delivery from the idoc data and to post goods issue. Thereafter, i use BAPI_BILLINGDOC_CREATEMULTIPLE to create the billing document. Before calling this BAPI, I use a COMMIT WORK statement to update the relevant tables so as to enable invoice creation properly.
Problem: The COMMIT WORK statement takes a lot of time to execute (I have no update tasks that could lead to this), so much that the idoc (probably) has a timeout and ends up in status 64. As a result, the succeeding part of the code (after COMMIT WORK) is not executed and the billing document is not created.
When I debug this, the COMMIT WORK statement leads to a strange screen (which looks like a blank report output screen, with its title as "UPDATE CONTROL". However (of course), there is no timeout while debugging and the billing document is successfully created.
Could anyone provide some pointers to solve this problem?
regards,
Priyank

Answer 1

i have a custom function module Y_IDOC_INPUT_WMSPICK001 which is responsible for idoc inbound processing. SAP PI sends the inbound data to ECC and once this is done, this function module is executed.
This FM has the following code sequence inside it...
1) Call the FM SD_DELIVERY_UPDATE_PICKING
2) COMMIT WORK AND WAIT.
3) Call the BAPI_BILLINGDOC_CREATEMULTIPLE
Step1 is successfully executed,  the step 2 takes a long time, and after that, the step 3 is not executed at all and the idoc ends up with a yellow light (status 64).
hope it clarifies what I am doing
regards,
Priyank