Inkonsistent master datamodel when deleting slaves with the master GUI open

The problem was recognized with B&R in AUtomationStudio, but can also be partially reproduced with PactWare 4.x.

1. Add multiple slaves (2 Slaves or more) to the EtherCAT master "cifX RE/ECM" .
2. Open the slave GUI, select “Modules,” click “Add Module,” then “OK,” and close the GUI window.
3. Open the Master EtherCAT GUI without taking any further action, and attempt to delete the Master DTM.

The following window appears:

It indicates that after deleting the first slave, the working-datamodel is set to dirty, and deleting the second slave triggers the message above.