A dockable form cannot be modal. It's documented in Dockable Property help topic.

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>Do Form "form_name" TO "var_name"
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>and the form is modal and dockable=2, the program is not stopping at the form and is comming back the calling program raising an error:
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>"the to clause can only be used with modal forms or formset"
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>is this a bug or is a by desing error??
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