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Power Platform Community / Forums / Power Apps / Error while patching: ...
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Error while patching: "No coercion operator is defined between types 'System.Guid' and 'System.String'."

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I get the above error while trying to update records in my SQL able. I pulled data from this table into power apps using the "external table" functionality. 

 

I can create new records fine with the patch > defaults function but I can't update existing records because of the above issue. 

 

Any help please? 

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  • timl Profile Picture
    36,785 Super User 2026 Season 1 on at

    @Williams_O 

    How are you updating your record? Are you calling Patch or are you using a form? If it's the former, can you post your formula?

  • WO-23071515-0 Profile Picture
    on at

    I'm calling patch function on a form. 

    Williams_O_0-1681592531204.png

     

  • WO-23071515-0 Profile Picture
    on at

    @timl 

  • timl Profile Picture
    36,785 Super User 2026 Season 1 on at

    Hi @Williams_O 

    I'd change the following line as follows. Hopefully, that'll fix the problem.

    ID_SITE: If(IsBlank(VarSiteinfor), GUID(), GUID(VarSiteinfo.ID_SITE)),
  • WO-23071515-0 Profile Picture
    on at

    Hey @timl thank you very much for your help, but this didnt work. It gives the same coercion type error. 

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