Hello Alexander,
If your delta loads are running daily and 0 records are extrated, even if you have data in SAP ECC, then the records with error LUW's should have been struck. With the help of your basis person, delete the error LUW's(error/bad record) in the trancation code LBWQ/SMQ1 and selecting the communication table I.e., MCEX** (if batch is not running there should be lot of records in here)
ABAP Program RMBWV311
Batch number: LIS-BW-VB-APPLICATION_11_xxx
Check if data in queue table
Transaction SMQ1 - MCEX11 (if batch is not running there should be lot of records in here)
BWxxxxxx_2LIS_11_VAHR (if batch job is running then there should be records in here)
Regards,
Satheesh Reddy R