The connection to Motown and/or Detroit might be because the only song with this title registered at BMI is a Edwenna Edwards & Randy Diamond composition .... but it has no publisher listed .. if it was a Motown song I do not believe that would have happened .... Edwenna co-wrote 'Honey Bee', recorded by the Supremes, and Randy wrote 'No Part Time Love For Me', recorded by Martha Star.
As I said in 2012 there is no record of this in the Motown database
So unless somebody can connect Edwenna or Randy to Dallas then I think we can discount the Motown / Detroit connection and just assume it's a coincidence on the song title
But having said all that we have the account from Rob Moss which blows my view out of the water
A mystery indeed
Andy