What is tax code 291 mean? The explanation. TIA!

are you asking about tax code section 291 or transcript code 291

as for transcript code 291

Abates a previously posted 150 and/or 290 or 300 in whole or in part. Generates abatements (TC 197) of computer-generated interest where applicable. Releases same freezes and holds as TC 290. TC291’s, MFT 10, Blocking Series 500-519, have been designated for FUTA use only. A Reference Code of 998 or 999 is generated by BMF files respectively from Alpha Code “T” or “W” along with a valid state code on FUTA Adjustments. May need priority and/or hold codes. IMF needs reason and source codes.