I need used the function "startswith", for to validate if the field begins '026', like that
but don't works.
is the "{Self}" dropdown choice control or lookup control?
+7
yes its dropdow
but choice or lookup?
both of them can be rendered as dropdowns...
+7
Lookup
Then your formula should look like
startwith (parseLookup ({Self},true),"026") ....
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