Diagnosis
Subtransaction &V1& in combination with main transaction &V2& exists intable TFKTVO. These subtransactions have a special meaning (such astransfer postings in invoicing) and can therefore not be used in therate steps.
Example
Table TFKTVO contains a subtransaction for main transaction"Consumption billing" that is used in invoicing to find the receivablesaccount. You cannot use this transaction to allocate a revenue accountto a rate step.