Error updating Main Account in AX?

When I try to update the Main Account via excel addin I am getting the following error

MainAccount.createList Line=4, Pos=4, Xpath=/MainAccount/MainAccount[1] The class AxCommon does not have a parmDEL_ConversionPrinciple method or field DEL_ConversionPrinciple is missing from the query.

Update has been canceled.

Any idea what could cause this error and how to fix it. Thanks a lot