Change mailform for Availability Control e-mail in Project Systems

Hi Experts,

We have set up availability control and maintained all the necessary tables in order to activate this.

We are also auto forwarding this emails to outlook using SO36.

Presently , mail content is as follows :

Controlling posting 100007807

The assigned funds are 807.22 INR less than budget in document item

001 WBS element GSC-15-006-1-1-1-1 .

I want to change content of this mail.

how can i do this ?

Thanks