# Dynamic default overlaps user answer in select\_one question

**URL:** <https://forum.getodk.org/t/dynamic-default-overlaps-user-answer-in-select-one-question/28103>\
**Category:** Support\
**Created:** [July 8, 2020, 5:14pm UTC](https://forum.getodk.org/t/dynamic-default-overlaps-user-answer-in-select-one-question/28103 "2020-07-08T17:14:44Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Grzesiek2010](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/grzesiek2010/32/2881_2.png) [@Grzesiek2010](https://forum.getodk.org/u/Grzesiek2010)\
**Post date:** [July 9, 2020, 9:38pm UTC](https://forum.getodk.org/t/dynamic-default-overlaps-user-answer-in-select-one-question/28103/2 "2020-07-09T21:38:56Z")

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Hi @ricardonfc  
welcome to the forum! Please [introduce yourself here!](https://forum.getodk.org/t/introduce-yourself-here/6671)

It's the way it works it happens because calculation is always evaluated and always returns a value even if it's null or empty string...

@LN isn't it possible to evaluate calculation only under some circumstances like in this case? If it isn't possible maybe we should consider it?

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