From my most recent question, I am a manager with about 10 years of experience, working in a company with a matrix management structure in which team members also have a PM for a secondary manager.
I recently started dating another employee who is a PM for a project two of my team members will be joining. We both want to continue our relationship.
As a result of both of us having disclosed our dating relationship to HR per company policy, HR wants to move my 2 team members out of my vertical functional command to report directly to the PM so she becomes their functional manager and project manager during the life cycle of the project which can be up to a quarter or more.
The current reporting structure is a conflict of interest and puts me in a highly undesirable position of potentially having to mediate between my 2 team members and the PM I am dating were performance issues to develop while they report horizontally to her.
I am reluctant to accept the proposed solution by HR as the stability of my team is impaired by the frequent changing of functional managers for team members on projects, for as long as I am dating her... In the future, this same dilemma may develop on new projects ad nausem. Moreover, this is the first time the PM directly managed people vertically. I also do not want set the precedence that having team members being shuttled back and forth for a problem not of their making is somehow an optimal solution as @Nvoigt said. If my girlfriend is not an PM and will never have horizontal reports, this dilemma would be moot.
My goal is to foremost not have my two team members' career be negatively affected as a result of the conflict of interest. Secondarily, I do not want our personal relationship in early dating phase to be marred by possible disagreements arising at work.
How can I push back professionally that the HR proposal is untenable in the long run in my opinion?
Is such action advisable coming from a manager?