Hide Session-Types that are not available any longer on the second submission
When a Submitter submits a Session, he/she is presented with a Choice of Session Types. Each Submitter can only submit one SS and one IP.
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As soon as he/she submitted one IP, he/she should only be presented with the Choice for SS-Types and not be able to submit another IP.
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As soon as he/she submitted one SS, he/she should should not be presented with any type on a new submission and not be able to submit an SS any longer.
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If he/she submitted in both types, he/she should no longer be able to submit either type.