There are few reasons why the software model isn't auto picked while you import the entitlements.

• The given software model wasn't there in your discovered list (or if the s/w model is there, then the DMAP isn't mapped correctly)
• The reference fields used in s/w model isn't there (like Publisher from "core_company" table, Product from "samp_sw_product" or from custom product table)
• Sometimes even though the reference records are there, it wont have the proper attributes. Say for example, publisher named ABC might have been in the core_company table; but it may not be indicated as "manufacturer" (you need to check that flag)

If you find the 2nd one is the reason - then please create those referenced records in the respective tables and then load your entitlement sheet again. This time it will proceed without any error.