Recently I have came across a scenario in which I have to change the linkType of FormDatasource of OOTB form (InventItemBarcode) which have two datasources (InventItemBarcode & InventDim). InventDim have linkType (InnerJoin). Without Overlayring I need to change the linkType of InventDim to (OuterJoin) in order to show those items in this form which does not have any InventDimId. After some research I have found the solution. See the screen shots attached.
Community Post: https://community.dynamics.com/ax/f/33/p/266905/753942#753942