Diagnosis
Clicking on 'Bank data' under 'Further checks' when field checks arecarried out for the various countries, activates check digitvalidation. For this, a fixed entry format is necessary, depending onthe country involved. Your entries are checked automatically with ageneral format check, provided the fields 'Bank key: length' and 'Bankkey: check rule' (this also applies to field checks for countries) havebeen correctly maintained. If the named fields have not been correctlymaintained, the format check will check for a format with which thecheck digit validation cannot be carried out.

Procedure
Check your entry.
You may also need to check the settings for the field validations ofthecountries.
Possibly you also need to change the 'Bank key: length' and Bank key:check rules' fields.
To deactivate check digit validation, cancel the 'Bank data' switchunder'Further checks'.