Receivables Manager -> Transactions->Tools->Create Accounting

I've tryed to run for my transaction as follows:  Tools-> Create Accounting and chose to Post but after some time it returned a message on the screen that transfer can not be completed.

I've researched - what actually has been run and how tables are populated for this particular transaction. I can see that only Create Accounting ran  and 'completed successfully'. There is no specific messages in the log regarding any errors/warning. Tables xla_events and xla_transaction_entities are populated fine per this tansaction. Tables xla_ae_headers, xla_ae_lines and xla_distribution_links are populated for this transaction but    for instance, xla_events has event_status='U' (unprocessed) and process_status_code='I (Invalid) for this particular event_id.... How do I troubleshoot further? How do I find out  the reason of this 'Invalidated' event?