Process chain starting twice

Hello to all,

hope I 'm writing in the right discussion.

I'm trying to execute a process chain from a workbook.

This are the steps I did:

1. I created a IP workbook and I add a button
2. I Selected : planning specific command
3. populated with CMD ( Execute planning function) - Name of planning function - data provider filter ( with the name of the provider)
4. saved
5. created a planning function in which I write just a call function to trigger the event to start the process chain.

The issue is:

when i press the button, the process chain start twice.

I tested executing the function module from SE37 and the process chain start just one time.

it happens to someone?

Kind regards

Rino Sica