Tried this morning to proforma my 2019 clients into 2020 Proseries. 

Out of my test batch of 46, only 7 came through (and 3 of those 7 were 1 MFJ + 2 MFS for the same couple). No rhyme or reason why the ones that pulled through worked while the others didn't.

The rest had this error message: An unknown error occurred while attempting to transfer (146).

I tried running updates of both the 2019 & 2020 softwares, shutting them down and restarting them but nothing helped.

Anyone know what is going on?