# Revit - set back blank parameter valule

**URL:** <https://forum.dynamobim.com/t/revit-set-back-blank-parameter-valule/15143>\
**Category:** Revit\
**Created:** [September 27, 2017, 9:18am UTC](https://forum.dynamobim.com/t/revit-set-back-blank-parameter-valule/15143 "2017-09-27T09:18:18Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Pawel](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@Pawel](https://forum.dynamobim.com/u/Pawel)\
**Post date:** [September 27, 2017, 9:18am UTC](https://forum.dynamobim.com/t/revit-set-back-blank-parameter-valule/15143/1 "2017-09-27T09:18:18Z")

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Hi guys,

I’m tying to set blank value of some shared parameters but get this error message

![2017-09-27_1116](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/f/8/f888ad0406d31272f0da9ac88a360ac5713ddd2e.png)

It might be Revit limitation probably or you have some ideas?

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**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [September 27, 2017, 9:31am UTC](https://forum.dynamobim.com/t/revit-set-back-blank-parameter-valule/15143/2 "2017-09-27T09:31:39Z")

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What format is the parameter? If it’s a string you can set it to “”. I could guess at others as well but need to know what the type of value Revit is looking for.

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**Author:** ![Pawel](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@Pawel](https://forum.dynamobim.com/u/Pawel)\
**Post date:** [September 27, 2017, 11:34am UTC](https://forum.dynamobim.com/t/revit-set-back-blank-parameter-valule/15143/3 "2017-09-27T11:34:25Z")

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it’s integer - therefore it is not possible to set blank - i think so. But before inputting any value this parameter is “empty” blank but when we put value than Unit appear and thank back to blank is not possible:confused:  
am I right ?

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<div class="post-metadata">

**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [September 27, 2017, 11:47am UTC](https://forum.dynamobim.com/t/revit-set-back-blank-parameter-valule/15143/4 "2017-09-27T11:47:17Z")

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As far as I am aware, this is correct. It would be possible to write the data out to a XLS or CSV, remove the shared parameter, and recreate it maintaining a blank value where desired by reading a modified version of the XLS or CSV, though associated data may be lost in this process so I’d be certain this is a requirement (it likely isn’t).

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<div class="post-metadata">

**Author:** ![Pawel](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@Pawel](https://forum.dynamobim.com/u/Pawel)\
**Post date:** [September 27, 2017, 11:49am UTC](https://forum.dynamobim.com/t/revit-set-back-blank-parameter-valule/15143/5 "2017-09-27T11:49:18Z")

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Yes I was also consider to tun it through exc/csv i need test it .

thanks