how to refresh the IDoc type for a message type?

Hi guys.

I'm doing a R3<-->R3 integration with ALE.

I used to define a extension ZMATMAS for message type MATMAS with basic type MATMAS05, but later I found that this extension is not needed any more, thus I deleted this entry in we82.

But after that, the IDoc I send use BD10 has the status 26 problem,this problem happens in the outbound R3 when check the syntax of the IDoc. I found that the message that is sent still has the extension ZMATMAS, in which there's a mandatory segment.

So, did I miss certain steps to refresh the message type zmatmas?

Thanks in advance.