How I can modify list element numeric value since one repeat group field element value?

I'm on your site now, but I just don't understand how the two lists relate.

How do I know which repeat rows in insumos_linea_modelos needs to be update, with the data from the row in the fab_ordenes_pedido repeat group.

I need to know which field in the insumos_linea_modelos is the foreign key to fab_ordenes_pedido. How the two are related. So when the fab_ordenes_pedido is submitted, what element value in that form do I use to select the row(s) in insumos_linea_modelos (well, the parent_id in the repeat group rows) that need updating?

It doesn't help that it's a foreign language for me, so none of the table or field names make any sense, and I have no idea what the app does, or what those two lists are showing. So to me it's just a jumble of alien names that mean nothing, and trying to figure out the relationship is impossible.

-- hugh
 
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