Attach a conversion rule to a LinkedIn campaign (ad set)

Attaches a conversion rule to a campaign (an ad set in Campaign Manager), or detaches it, so LinkedIn reports that conversion against that campaign's spend. Use when: a campaign reports no conversions although the rule exists and fires, and whenever a new campaign should be measured against existing tracking. LinkedIn associates rules with campaigns individually and a new campaign inherits none — attaching is a separate, deliberate act, and this is the tool for it. Do not detach a rule to "clean up" reporting: the campaign's conversion history stops being reported against it and the numbers the user saw last month will no longer reconcile. Do not attach every rule to every campaign. A campaign attributed to five rules counts five different things as success and its cost per conversion becomes meaningless. Returns the rule read back with its campaign list, so the attachment is confirmed rather than assumed. Attribution is not retroactive in reporting for periods before the association — say so when a user expects last week's conversions to appear.