The Central Credit Committee (German Zentraler Kreditausschuss / ZKA) is an industry association of the German banking industry. It was renamed to Die Deutsche Kreditwirtschaft (DK) in August 2011
XMLdation currently has validation service for the following payment definitions:
DK SEPA Credit Transfer v2.6 DK SEPA Direct Debit v2.6 DK SEPA Credit Transfer (CCT) v2.7 DK SEPA Direct Debit CORE (CDD) v2.7 DK SEPA Direct Debit COR1 (CD1) v2.7 DK SEPA Direct Debit B2B (CDB) v2.7
The specifications for these can be found from EBICS: http://www.ebics.de/index.php?id=77
DK uses a stripped version of ISO 20022 schema. This means myriad of institution specific rules are already defined at schema level.