I keep using a!refreshvariable but never work, I want it keep read the renewal data from database?
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The configuration should be within a!localVariables(). When used within an interface, the value of the variable can be refreshed under a variety of conditions. When used outside of an interface, all refresh properties are ignored.
And if you want to renew the data, then you can try property of a!refreshvariable ie refreshOnVarChange so that data can be refreshed on the basis of variable change