START PROCESS command doesn't work

I'm trying to use START PROCESS MakePayment2 command in THEN Action
but I getting error:

rule '' uses business object 'MakePayment2' which has not been found

Don't use START PROCESS. Just call MakePayment2 without START PROCESS.

START PROCESS is for something else altogether - check the Rule Language Guide.

Ok now I understand.

I use ProcessName to start process
and
START PROCESS BusinessObject.Attribute
to get process name dynamically from Attribute.

Thanks again, I'm close to the end of my first sample but useful app 🙂