Error while updating header discount with BAPI_SALESORDER_CHANGE

Hi guys,

i am trying to update the header discount of an order via BAPI_SALESORDER_CHANGE.
This work well with normal positions.
But in some cases the orders contain textpositions to give them a litte bit more structure.
These positions don't have any conditions.

In these cases the BAPI returns that an error with pricing procedure occured for the textpositions (KOMP-FXMSG = 801 ).

Is there any chance to bypass these positions or another function module to update the header discount?

Thank you very much!