Hi Allan, great question! TurboTax Business edition is capable of handling Form 1065. I found a link that shows a list of all of the tax forms TurboTax can handle. If you are having an issue with getting it to accept the information, contact the support team for assistance. It could be that you have to enter the info in a certain way to get it to accept it.
Here is the link to the TurboTax Business Edition. Scroll down to Tax Forms and you will see the list:https://turbotax.intuit.com/small-business-taxes/.
Good luck with everything.
Crystalynn Shelton, CPA