Execute planning funtion during promotion save

Hi experts,

Is there a way to automatically trigger a BPS planning function when the user save the TPM promotion?

I was looking in BW for a BADI but i cannot find anything, is already there a standard BAdI in bw that does this work? do you know where i have to integrate and call this BAdI under the CRM promotion save button?

Realkly thanks for your help

Alessandro