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GD&T: modifiers on datums

First off I just want to say that I am new to this forum and somewhat new to PCDmis. This is completely different from what I was use to.
I want to say up front please forgive me if I do not understand what you are talking about which may lead me to ask more questions with what answer you post.

I will make this short and sweet. I have 2 questions.

First question
Can a person place a modifier on a primary datum? I am using xactmeasure. It will allow me but I was told by my supervisor that it was not allowed. Is this correct?

Second question
A print calls out for a modifier on the secondary datum but that datum is a constructed line. Xactmeasure will not allow me to add a modifier, I'm assuming since it is not a feature of size. Does that mean I need to tell them they cannot use a modifier for that particular datum or is there some way I can manipulate from a line to something else to get the modifier added?

Thanks to all who reply.
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