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Syed Moin PashaSyed Moin Pasha 

Unable to edit the Field of Package level

Hi,

I am beginner in lightning We have field on Contact named ContactId which will get updated with created Contact Id and this Field is in Package level. It is not allowing me to Update the field in the Development org  in the General Setting of the field I have selected unique(Do not allow duplicate values)  Treat "ABC" and "abc" as duplicate values (case insensitive) I just want to Update it to Treat "ABC" and "abc" as different values (case sensitive)
Please help me out with this
Devi ChandrikaDevi Chandrika (Salesforce Developers) 
Hi Syed,
It is not possible to edit managed package components.That is why you are not able  to update the properties of the contactid field.

Please refer below link which might help you in this
https://salesforce.stackexchange.com/questions/179615/how-can-we-change-existing-managed-package-field-to-unique
https://help.salesforce.com/articleView?id=sharing_apps.htm&type=5

Hope this helps you
If this helps kindly mark it as solved so that it may help others in future.

Thanks and Regards