User exit MWMTR001

Dear experts,

I want to use exit MWMTR001, function module EXIT_SAPLL03T_003 to update the Transfer requirement with the Order number created in COR1.

But I see that by the time the user exit is called, the order number has not yet been created in the database.

Is there maybe another place to do what I want?

Thank you in advance,

Roxani Athousaki