Billing Documents are missing for Datasource 2LIS_13_VDITM
As part of the Regular Delta load Datasource 2LIS_13_VDITM sometimes miss certain Billing Documents and this is intermittent issue.
Delta mode is set to Queued Delta for Application 13.
I pulled the missing Billing Documents using Repair full load.
I checked the may threads on SCN and SAP Notes but couldn't found any solution for this issue.
Could you please suggest possible cause for this issue and resolution.