Hi Max,
I am not really sure if this datasource is change pointer based or not. But in case of datasources dealing with BDCP2 and CDHDR the RSA7 delta queue remains empty when you create any new data. However, when you extract the delta data it gets extracted in BW system.
Ideally this kind of datasource store only the repeat delta data and delta data is decided internally by Fm based on change pointers.
Can you try creating some data and then extract it in BW system? if any data is extracted in BW system then after that you check the delta queues in source system in RSA7. You should be able to get the records which are already extracted in BW system.
Please let me know the results.
Thanks
Amit