Projects Import - Exceptions stages

Hi,

I would like to know at what stage of Projects Import - does the various exceptions kick in. i.e. exceptions in PRC: Transaction Import, PRC: Distribute Usage and Miscellaneous Costs and PRC: Generate Cost Accounting Events

we have a scenario

1. user uploaded a WEB ADI sheet

2.the PRC: Transaction Import completed normal and a Expenditure batched was created with a released status.(at this stage the DR and CR has not yet created, only the expenditure lines)

3. ran the PRC: Distribute Usage and Miscellaneous Costs which completed with Exception: "AutoAccounting error: null ccid" - which turns out there was a cross validation rule violation.