Hi, I think i found how automatize internal reference :

I searched in Sequences : I found product.field_product_product_code product.field_product_product_default_code guess i have to use one of theses in order to create the sequence.

But : The entry which i'm supposed to enter Code in Sequence code is not long enough to enter theses two Complete ID (product.field_product_product_code , product.field_product_product_default_code)

Is it a bug ? Can i do something (i prefer without changing the code)

Thanks for your help, Sorry for my English

Marty