Populating fields from the Layout Region to Parent Document

Hi , I have a button in a form which is using @DialogBox Form which calls a form that has a layout region .Now the problem is if I open an existing document which has values in the parent document and if its seperated by space then when I make changes to the field say Part name then only the part of the value which is preceding the space is saved in the parent document . The Parent document field is a multi-value and I have put sperators as semi-colons which the user will never use .I have played with the form properties such as formulas inherit value from selected document , changing the seperator options .

Any clue as if I am missing something.

Thanks …