Error BS001 when posting goods movment with FM WS_DELIVERY_UPDATE

Hi gurus!!!

We're facing this problem:

When posting goods movment wiht FM WS_DELIVERY_UPDATE, this FM throws error BS001 "No status object is available for HU ####".

This only happens when in the same Z t-code we do the following:

1 - Create Delivery;

2 - picking (WS_DELIVERY_UPDATE)

3 - post goods movment (WS_DELIVERY_UPDATE)

If, for some reason, we leave transaction between 2 and 3, everthing works fine.

I've checked my code, and after every call to WS_DELIVERY_UPDATE I have a "commit work and wait"....

Did I miss something?

Do you have any Ideias?!

Best regards,

Carlos Constantino