InfoPath Dev

I have a two submit buttons; Sub1 and Sub2, and a multi select field with options A, B, C, and D.  I'd like to set a rule that uses Sub1 when field equals B only.  So far, when I set the condition to submit using Sub 1 if field = B, when the field = A, B, and C, the form still submits using Sub1.  Any idea what formula I should use for an "only" condition?

Hmm. I would use conditional formatting to disable the Sub2 button if field is not equal to B and disables Sub1 if field = A or C. You'll have to click on the ADD on the formatting condition and make sure you change the dropdown from "and" to "or". But, should be pretty simple. Probably you are just missing something obvious. Send us email if you can't figure it out.

Apologies, i mis-stated the original problem.  I only have one submit button but it uses two different data connections Sub1 and Sub2.  If multiselect Field = B, the condition should kick off data connection Sub1.  If Field = anything other than B it should use Sub2. 

If it is equal to B and C or any selection and/or combination that is not B only, it should submit to Sub2.