As mentioned in character conversion service, bidi transformation service can be called through CUNLCNV or CUN4LCNV by a special technique B that can be used along with the rest of the technique search order. For more information, see Calling the bidi conversion services.

The B technique is searched at the end of current "RECLM" search order when a technique search order has not been specified. Instead, it is used with RECLM. bidi transformation services are called only when B is specified. Character conversion services work the same as specifying any of the existing techniques without technique B.