AutoPatch error: This patch is not compatible with your current codelines

We are trying to update patch on R12.2 for split task API.

But getting error

AutoPatch error:

--------

This patch is not compatible with your current codelines.

This patch is compatible with: entity 'wms' - codeline 'R12.WMS.B'.

Your current on-site codeline for the entity 'wms' is: 'R12.WMS.C'.

You should not apply this patch.

Apply an equivalent patch that is compatible with your

current codelines instead.

We searched and come out with - there is no RUP patch for R12.2 ; Is it true ?? if not then please provide solution to avoid this error.