Increment Every time message is sent

Hi,

I am working on a custom module. In this one of the requirements is to increment on field say CustomerDataNumber by 1 every time the message is sent. Thus when first time message is triggered the value of this field should be 1, second time when message is processed it should be 2 & so on. When I transport this to QA or production, the counter should again start from 1. A similar requirement has been discussed in these posts, but an RFC or JDBC lookup is not possible for me. How to do it inside a custom module. Please note that this sequencing is Not the reason why I wrote this module.

http://scn.sap.com/thread/1822028

Regards,

Rajat Singh