Problem using Allow Posting From/ To in user setup

Allow Posting From & Allow Posting To are used for users in User Setup in G/L. When a User is trying to Post documents related to Items such as P.O, Item Journal and S.O the user gets an ERROR Message(‘Posting Date not within your range of Posting Dates.’) This happens when Inventory Ledger Entry has some lines whose Cost needs to be adjusted when posting for Invoice. Posting Date on Inv. Ledg. Entry record accessed for adjustment purpose is not within the range defined in Setup. Have any one experienced this problem and help me in resloving this issue. Thanks in advance, ERP Project Manager (Navision Financials)