SAP Message TU261 - Cannot create payment schema for CA &1 because you entered coll. acct.

Diagnosis Cannot create a payment schema for contract account &V1&, because youhave entered a collective bill account in the contract account. Payment schemas are only possible for contract accounts with budgetbilling procedure 04 (payment schema). They must not be linked to acollective bill account. Procedure Remove the link to the collective bill account.