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.