There is some confusion ,
If you have usedQA11 >.Reserve >. It means it has to be 350 mvt.Now what you are saying is you used
the cpy of 323 which is actually a Material to material "Q" Transfer which can only takes place through QAC2.
Check the material document created during Q to Q posting.Check the mvt type & how exactly it happened.
Logically you should able to use QA11 stock posting screen again if Inspection lot exists.