Change Participant Status (bulk task): financial_trxn.to_financial_account_id not set

Using Find Participants -> Update Participant Status task ... for Pay Later event registrations we transition the associated contribution status from Pending (Pay Later) to Completed and we properly insert a new financial_trxn row for this. However, the to_financial_account_id is not being set for this financial_trxn.

Since the form does NOT contain a payment instrument field - we need to use the default asset financial account in order to set the to_financial_account_id (same logic as back-office contribution form when user does NOT select payment_instrument).

To recreate:

• use online registration to register for sample event with 'pay later'
• from Find Participants, status = Pending (pay later) - select the participant and select task 'Change Participant Status'
• change status to 'Attended' and click Update Participants
  Contribution status will change to Completed (correctly).

Check financial_trxn table, you'll see two rows. One for the pay-later (Accounts Receivable) transaction, and second one for the completed payment.

Please check if other 'batch update' flows which use the transition status approach might also have this same issue.