SAP Message RQ412 - Selections for subledger accounts are limited due to RE-FX update

Diagnosis
Flexible Real Estate Management is being updated (RE-FX) to CashManagement.

Procedure
Subledger accounts can only be generated together. Specifying accounttype 'D' means that account type 'K' must also be specified, and viceversa.
It is not possible to limit by customer and vendor accounts.