[18.0][REF] product_contract: simplify contract line upsell/downsell code#1383

anthonissen-a wants to merge 2 commits intoOCA:18.0OCA/contract:18.0from

acsone:18.0-product_contract_ref_upsell_downsell-aanacsone/contract:18.0-product_contract_ref_upsell_downsell-aanCopy head branch name to clipboard