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Oh ick. That looks like maybe it is the authentication window? I guess I'd make sure my Office account was correct first. I'd also make sure "remember me" was checked for my SharePoint online login in my browser..... Let's see - I'd also maybe try with a new blank form, just in case that makes a difference. This is just ...
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See attached with a sample of using validation for this. Save the file locally. Right click and select Design to open in design mode. From there you can preview and try it out.
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Is the InfoPath form bound to a list? Or does it submit data to a library? I'm asking because I'm not sure what the circumstances are in an InfoPath form where you aren't allowed to change the data type - I know list bound forms have to have the data type changed in the list for example. Sorry - I hadn't noticed your screenshot was ...
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Is this a SharePoint List form? Any chance a character limit has been set on the field?
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This link has a few screenshots that may be helpful: http://www.ntss.eu/infopath-2013-populating-a-data-field-based-on-another-field-i-e-external-connection-2/
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I wonder if part of the problem is that the Unit Price field is a choice type. Maybe change that to number?
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I changed the default value for your existing Unit Price field. See if this works as anticipated. Save locally, right click, select design to open in design mode.
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Here's a sample. Set Value Sample view has a dropdown with a rule on it you can take a look at. Save the form locally, right click and select Design to open in design mode, then you can preview.
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See attached, save locally, right click and select Design, then you can preview
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We add a filter when we select the table row to get back just the selected one... Do you mind attaching your form? I can set this up for you so you can see it.