Form 851 - Affiliations Schedule This is an example of a completed fiscal year Form 1120. Form 851 and Form 4227 are attached. The Tax Period, ABLM Code 010, Action Trail 590-014, and Action Code 342 are edited.The Accounting, BMF and Other (explain) boxes are marked on Form 4227. Total prepaid credits do not agree is edited in the Other (explain) area.