Header not repeated - AX 2012 SSRS Reports
A good blog to resolve the issue for column header repetition. Repeat the column header row on every page Tablix SSRS dynamics Ax 2012 https://community.dynamics.com/365/financeandoperations/b/alirazatechblog/archive/2014/10/13/repeat-the-column-header-row-on-every-page-tablix-ssrs-dynamics-ax-2012