InventDim not link to item code

Dear All,

I have a new table contains relation1 and relation2 fields. Relation1 could be either itemId or Item group. I'm using pricediscItemRelation as its EDT. I've added inventDimId in my table, and the relation has created automatically.

The problem is, my inventory dimension is not link to my item code. It always blank. Could anyone tell me what did I miss ?

Best Regards,

Afin