RTF Template with multiple sheets

Summary:

RTF Template must push out results in Excel with mutiple sheets

Content (please ensure you mask any confidential information):

I have put in place a rtf template that must give me the results in excel and for each business unit it must generate a separate tab in excel. At the moment it pushes out the results as below.

My expectation is that for each BUSINESS_UNIT that sits in G_1 it should create a tab and name it to the value of that BUSINESS_UNIT

As you can see however it comes out in one tab

I attach my xml for review and my template