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Formula works on web UI but breaks the mobile app

Hi All

I posted a question yestrday about DefaultSelectedItems as I was having trouble setting DefaultSelectedItems whilst having a formula in the ITEM property to sort/filter

@KroonOfficeSol posted a great solution which worked beautifully. But I noticed this morning that it breaks the mobile app?

As soon as I paste this formula into the DefaultSelectedItems of ComboBox1 the mobile app returns an error saying "The requested operation is invalid", photo attached.

LookUp(Distinct('[dbo].[MobilePOLog]',Supplier).Result, Result = Supplier)

 Yet everything works fine from a web broswer. No errors and my SLQ table is updating!?!

I've also attached a screenshot of the data properties on ComboBoxes

Any help would be appreciated. 
Many thanks



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