Checking what value is selected in the combobox

[Anonymous]

Hi all, 

Could someone please advise how it would be possible to achieve such a scenario?
1. In the combo box which allows multiple selections, the user selects items A and B;

2. IF condition in the other fields recognizes that the selected items includes selected item B.

My current IF function looks like this:

 IF(User().Email = Test.Selected.Email && LookUp(DocumentTypes.SelectedItems,Text(Value) = "B"), true, false)

the following error is shown here: Invalid argument type. Expected Boolean, Number, Text, OptionSetValue.

Also tried the function below, but get the error of invalid argument

If(User().Email = Test.Selected.Email && DocumentTypes.SelectedItems.Value = "B"

 
Many thanks!

[eka24 · Accepted solution]

Consider this:

If(User().Email = Test.Selected.Email && "B" in DocumentTypes.SelectedItems.Value ,true,false)

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[Anonymous]

Noted. Thank you very much!