Missing event_id for credit memo application

Hello

We are having a situation where every month, there are hundreds of creditmemo's that remain as unposted items, when in fact they have been posted to GL.

This query confirms it.

SELECT ra.receivable_application_id,

  ra.customer_trx_id,

  ct.trx_number

  FROM ar_receivable_applications_all ra,

  ra_customer_trx_all ct

  WHERE ct.customer_trx_id = 5446001

  AND ra.posting_control_id = -3

  AND ra.application_type = 'CM'

  AND ra.event_id is null

  AND ra.customer_trx_id = ct.customer_trx_id

Working on numerous SRs, recommendation is to apply RPC4 patch.

We are currently on R12 AR RPC Aug 2014 and R12 SLA RPC Aug 2014