Just to rectified this... Today I was installing EP on another site and when I was going to enter this user defined field, I noticed that (since I get the options from previous entered text there) when I entered before on the site we were working I entered producst_id and that's why it didn't do the effect wanted. STUPID ME to not put my eyes on details like this.
Well, so there's one less mystery of this whole dilemma.
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