Diagnosis
There are only five subscreen containers with tab strips. Under normalcircumstances this supply should be more than sufficient. If you wantto display many encapsulated BDT dialog screens and/or many BDTinstances at the same time, the situation can arise that there are nomore subscreen containers.

Procedure
Reduce the number of encapsulated BDT dialog fields and/or the numberof BDT instances that you want to display at the same time.