Expression working only for once and not afterwards

[MA8731174]

hello community,

      I have an expression which has value true and when i evaluate to fill the checkbox means to make the checkbox true then it works fine but only for the first time and now when i evaluate this validator again second time.. means it needs to return me true again then it does not return me true. any one has an idea why its like that?

so its only working for only once and then not.

[dgg]

Change the value of the attribute labeled Data Change Type to "Always".

dgg

[TonyZhang]

Hi @MA8731174,

I cannot see the screenshot you provided.

Could you please share the mashup entity and replication steps?