YTH is the abbreviation of Yurtiçi Takas Hesaplaşma (Domestic Clearing and Settlement). It is the general name of the clearing system managed by BKM.
In the clearing system, prefix values are held in fields F32, F93, F94 and F100.
Why are prefix fields important?
The fields identifying institutions in clearing files show which institution a record belongs to and where it will be sent. Filling these fields incorrectly may cause the transaction to be routed to the wrong institution or lead to reconciliation differences.
For this reason, software that produces clearing files should strictly validate the length and content rules of these fields. Checking with sample files in the test environment catches errors before they reach production.
For the exact definitions of the fields, the current file format document published by BKM should be taken as the basis.
Testing and control recommendations
When producing the file, the length, padding rule and list of allowed values should be validated separately for each field. If the reason is clearly reported when faulty records are rejected, the operations team can resolve the issue quickly.
