I want to delete a POS Posting Transaction but system pop up an error.
DB concurrency violation.
Possible Reason :
POS Posting Transaction post to G/L Cash Book (CB), Journal (JV) or A/R Invoice. Their linked source was somehow gone or deleted by user.
1. On Cash Sale tab, Journal Entry tab, Refund tab & Credit Sale tab, check recent documents that have linked to any CB, JV or A/R Invoice.
2. Make sure all CB, JV or A/R Invoice posted from POS Posting already deleted.
3. Open Autocount or POS 5.0 Management Studio > Tools > SQL Query > Yes
4.Enter the following query to delete posting detail
delete from PosPostingDtl where dockey in (select Dockey from PosPosting where docno = 'Doc No.')
delete from PosPostingDtl where dockey in (select Dockey from PosPosting where docno = 'PP-000097')
5.Then enter another query to delete the master
delete from PosPosting where docno = 'Doc No.'
delete from PosPosting where docno = 'PP-000097'
6. Next, follow below FAQ for the next step to reset your True False trigger.
To prevent this problem from happening, pls untick this function:
Login Accounting / POS 5.0 Backend > Tools > Option > Category A/R & A/P > Aging and Statement > don’t tick Allow Edit or Delete A/R and A/P Documents Posted From Other Source.
By: CK 20220512, Jacky 20220523, P220525 
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