WO completetion missing in GL

We are having an issue with WO completions on some orders where I can see the IC transaction in the Cardex, but not in F0911. Does anyone having any thoughts as to what might be causing this or where we should dig further? We are using dclink and it's 24 7 manufacturing so we don't have any downtime for gl posting program.! Hence it causes some discrepancies. How can we solve it without closing the shop floor transactions for Transaction types IC.!