Business Unit Purchasing Options what does the Allow PCard PO to Close enable?

FSCM 9.2, PUM 46

PeopleTools 8.56.20

We recently implemented PUM 46, with a starting point of PUM 33. There is a new checbox on the Purchasing Options page "Allow PCard PO to Close" (Set Up Financials /Supply Chain>Business Unit Related>Purchasing>Purchasing Options). This checkbox came over checked when PUM 46 was installed. We cannot find very much information on the function of this checkbox, and what the system does if this is checked. Can someone explain?

Thank you,

Liz Lake