Problem

-- getting such error when building a project :

8002 - Unable to convert data from Java to C MAP_XXX.mdm /VARCAR/Maps line 0

Resolution

* such error has different cause

* one of the cause is triggered by the graphical editor when building a project

* the problem does not impact the deployment or the runtime of the related flow

* right click on the error in the "Problems" tab and delete it. then you will be able to simulate and deploy the object

* it will be fixed in a future Service Pack (target : 3.0.1 SP4)