Hi,
Can you try to actiavte your data source and check it.
Take abap expert help and check above function was active or not at ecc prod.
Before this load, is any transports/changes are moved to ECC prod regarding your data source?
at ECC side RSA3, Are you able to run data source extraction?
Can you try to run delta load at bw dev system. if its working well then you better to transport your data source to prod.
later replicate data source into bw prod and later activate data source.
Thanks