In version 20.11, we saw the introduction of a new System Preference "OPACSuggestionUnwantedFields" and the removal of "AllowPurchaseSuggestionBranchChoice" via https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=23420 This is a request to remove the AllowPurchaseSuggestionBranchChoice description from the official Koha manual. https://koha-community.org/manual/20.11/en/html/systempreferences.html#allowpurchasesuggestionbranchchoice
Noting that I am not seeing this system preference in the current main repository for the Koha manual.
Confirmed any trace of AllowPurchaseSuggestionBranchChoice has been removed from the master manual.