BEX Broadcast: text variable issue

Hello,

I encounter a new issue after a BW upgrade from 7.0 to 7.31:

some text variables stay blank in mail sent by Bex Broadcast.

We send workbook attached in mails and we use text variable as <DATE> or <WEEK> in mails fields like object.

I said some text variable stay blank because it still work for DATE but not for WEEK.

I asked to upgrade java patch corresponding to my support package but it doesn't fix my issue.

My system is SP 5 java patch 22.

Do you have any idea?

Nicolas