also  for
Account Number BatchID AgreementID
208 4551 304 44051 14 -> 3

the tDataCollection record that are being processed for 44052 have a blank in the SupplierServiceCodeID

there are 2 different DialledNo values in the tDatacollection for this,

DialledNumber=[TELSTRA.CORP]
we could also use a tAgreementDialled AltSSC lookup for this

howveer the other is blank
DialledNumber=[]
as there is no dialledno, there is no way to use the tAgreementDialled AtSSC code lookup.

The Question is why are is the SupplierserviceCode blank in thee tDataColllection?