Combination Level values getting overwritten by collections

Hi,

(we are using Demantra 12.2.3)

We are using a combination level (item branch category 4 / e1_it_br_cat4) to store some user data, however those values are always getting overwritten when running collections. I see in the data model wizard that Level Item Branch Category 4 is linked to source table t_src_sales_tmpl column e1_item_branch_category_4 and that column has a default value "N/A".

Can I somehow simply exclude that one from getting collected as I want to maintain that data fully in demantra and not load via interface from an external system?

Thanks, David.