As viewed in the EtaPRO Client | Configuration Tools | Error Log:
Description - Source value doesn't exist for point 'POINTID'
Procedure/Source - Summary/GeneralPhysics.Applications.EtaPRO.Transfer
Severity/Entry - Error - Error
The error is most likely derived from a User Defined Formula in which a function is attempting to retrieve a value for a tag that does not exist.
In this example, data point IPE.BAR.A would have a value tag "v" and possibly quality "q" tag in the historian, but not a source tag "s".
If the [tagType] argument is changed to an existing tag type ("v" or "q", whichever exists), the error will clear.