Cannot reserve packing slip quantity

Error:- Cannot reserve packing slip quantity, error getting when doing invoice.

The inventory quantity to match for packing slip xxxxx item xxxx cannot be reserved.

Solutions :- 

(1) Accounts Payable --> Periodic --> Clean up --> Purchase update history clean up'. Enter a date and the type of history you want to clean up.

(2)  Accounts payable > Inquiries > History > invoice history and matching details, search for Purchase order number and delete Ctrl+F9.

(3) SQL Query delete PURCHPARMSUBLINE where PARMID = 'PK000934'