Record already exists in Inventory module parameters (InventTableModule)

When I am using Product Entity I am able to import for first time. The second time if I am trying to import same data its throwing me an error like above. Generally it doesnt throw this kind of error. It just says updated/something like that without error. It should just update it. But why Its throwing this error? I tried checking the table records of InventtableMOdule. But I dont understand the reason for this. It used to work before, but suddenly I am getting this error. Any leads would be appreciated. AX 2012 R2, DIXF/DMF

Try to debug the code. It may be caused by a wrong customization, for example. Who knows?