APP-SQLAP-10771: could not reserve record

User reported  the following error

When attempting to update an invoice, the following error occurs:

APP-SQLAP-10771: Could not reserve record.

A database lock from another session has occurred on the table, AP_INVOICES_ALL, AP_INVOICE_LINES_ALL, AP_INVOICE_DISTRIBUTIONS_ALL.

To implement the solution on your instance follow the below steps:

         1.  Run the following to determine what tables are locked:
            

   SELECT a.object_id, a.session_id, substr(b.object_name, 1, 40)
                FROM v$locked_object a, dba_objects b
                WHERE a.object_id = b.object_id
                AND b.object_name like 'AP_%'
                ORDER BY b.object_name;

             
         2.  Look at the results and insert whatever AP_% tables are returned from a) into the script below:
            

   SELECT l.*, o.owner object_owner, o.object_name
                FROM SYS.all_objects o, v$lock l
                WHERE l.TYPE = 'TM'
                AND o.object_id = l.id1
                AND o.object_name in ('AP_INVOICES_ALL', 'AP_INVOICE_LINES_ALL', 'AP_INVOICE_DISTRIBUTIONS_ALL');

3.  Run the following:

    SELECT SID, SERIAL#
                FROM v$session
                WHERE SID = <SID from b)>;

4.   Once the locking sessions have been identified, please use the below command to kill such sessions.
          

ALTER SYSTEM KILL SESSION 'sid,serial#' IMMEDIATE;

Reference: