SAP PP-QM : Cancellation of Lot QA12

Hi,

What is purpose of Cancellation of Lot QA12 & what is business scenario we use it.

Also,

For a inspection lot we completed Usage Decision & Stock is been posted to Unrestricted Stock via QA32. Current status of the lot is UD ICCO SPCO STUP.

No we found that, something went wrong in Decision Making and want to change the UD Code to rejected and Want to post the Lot to Blocked Stock.

I called Cancellation of Lot via QA12, after which lot status is changed to LTCA ICCO SPCO. I want to know what i achieved in SAP using by QA12.

What is the step to be followed further to change my UD to Rejected and move stock to SCARP.

Thanks With Regards,

Dinesh V.