No Target Cost, since No GR

Dear Experts,

Users creating orders, issuing goods to order and technically closing it without GR from production order. When month end performed, then WIP and Variance entries passed after settlement.

Next Month wanted to reverse this WIP since lying in the Balance sheet GL. Here system is throwing error in KSS2, and in KO88 'NO Values to settle'.

Please guide to come out of this situation.