coulmns UBR_Summary_ID and UER_Summary_ID in pa_draft_invoices_all

Hi,

Does anyone knows about the relevant of these 2 fields UBR_Summary_ID and UER_Summary_ID in pa_draft_invoices_all and when it gets populated.

We have got an issue in few projects where instead of UER, UBR is getting hit. Ideally at any point of time, there can be balance in either of the account UER/UBR but not both. In our case, we generated the invoice upfront and so UER got credited initially. Now when we are generating revenue, its debiting UBR instead of UER. I was not able to find why its happening and it looks like, project is not able to determine that invoice has been generated earlier.