Error while Receiving a Purchase Order

Dears,

While i was trying to execute the Receive Order (P4312) it shows the below error:

RESOLUTION:
Blank - all postings are allowed.
'N' - the Account or Business Unit does not allow posting.
'B' - only budgets may be entered for an account.
'S' or 'L' - a subledger and type must be entered for all transactions.
'X' - a subledger and type are not allowed for any transactions.
'I' - the account is inactive, posting is not allowed.
'K' - the final budget is "Locked" or frozen and budget changes must
be entered using journal entries.
'U' - units are required for all transactions.