can any one please help me out on this

We noticed that sales bills (99%)not capturing in individual SAP customer ledgers from the period April 2017 onwards. We are unable to knock off the receipts against respective bills and posting under advance/suspense. Kindly look into the matter and resolve the issue at the earliest.

this is major issue we facing and we have checked all configuration everything is fine.

please do the needful

Thanks

rude