K-1 PTP converted to a corporation

CODI, Compass Diversified, converted from a PTP to a corporation on 9/1/2021. I did not sell the units (as a PTP) or the shares after the conversion in 2021. I'm not sure how to enter the disposition/disposal. The transaction schedule shows the final disposion on 9/1/2021 as "DZ" "Exchange". The TT options are:

* Complete disposition

* Disposition was not via a sale

* Sold and am receiving payments 

I thought it should be "Disposition was not via a sale", since they converted to shares and exchanged the partnership units for shares. But the next screen asks to enter the Purchase Date and Sale Date. And I did not sell the shares in 2021, so I don't know how to enter this K-1.

Thanks,

Tom