How to set default value to a reference group ProductDimensionGroup in EcoResProductCreate form?

i’m modifying the New Release Product form (EcoResProductCreate) and I’m trying to set the value of a reference group (ProductDimensionGroup) to a default value. I tried to set it to a RecId of the origin table EcoResProductDimensionGroup but it didn’t work for me!

The code that I tried to execute was in the initDefaultControlValues method:

select RecId,Name from _ecoResProductDimensionGroup;


It didn’t work for me and the drop down list text says “unknown”! Any advise?!!