SAP Message 67_LOAN026 - Choose a valid flow type

Diagnosis
For early repayments only use flow types from the following categories:
S (Outflow)
SA (Rolling repayment)
TZ (Interest)
TB (Charges)
TA (Discount Outgoing / incoming payment)
Note 1: Flow types from category TA are only permitted forproduct types managed on the basis of customer accounts.
The following flow types apply for charges:
Flow types from all categories with activity indicator '04' arepermitted (incoming payment) with the exception of those from categoriesKEIG and KFRE.
Flow types from all categories without activity indicator '04' arepermitted (incoming payment) with the exception of those from categoriesKT,S, SA and TTS.
The following flow types apply for individual charges:
Flow types from all categories with activity indicator '04' arepermitted (incoming payment) with the exception of those from categoriesKEIG and KFRE.
Flow types from all categories without activity indicator '04' arepermitted (incoming payment) with the exception of those from categories,S, SA, and TTS.
Note 2: Flow types from categories KEIG and KFRE with theactivity indicator '01' (receivable), which do not belong to producttypes managed on the basis of customer accounts, are always invalid.