Error on Processing rule TN

I am getting issue on TN when i try to change or modify any Processing Rule on TN

Error encountered while updating processing rule 50a0q4006tg9pa8u0000002c. The rule index cannot be changed during an update operation.

Please Advise

TN Version 7.1.2

Are you with latest fix TNS_7.1.2_Fix20?

What TN fixes you guys currently installed?

Getting this same error in 8.2 I get this even if I change the description and not any ordinal value or anything of substance. was there a resolution?