When workflow starting with API, should we fill in all parameters?

unknown

Hi,

I'm trying to start workflow with IONAPI.

When I fill in all parameters I set, I can start workflow.

However, one parameter is null, I can't although setting "when the parameter is blank,use for initial value."

All parameters are need to start workflow?

unknown

ION Process Automation abhors a null. If any parameters have the possibility of being blank, they should have the initial value specified.

Based upon your statement, can you not set an initial value?  Baring that, it would be best to set all the parameters.