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We should be able to support this using out-of-the-box functionality.
How to change a facility once it is uploaded?
Site_code is the unique identifier for each facility. Say you created a facility 'Starbuck' in district a with the site_code sb and you want to rename the facility 'Starbucks'. All you need to do is to update the facility name and re-upload it.
Can multiple facilities have the same name?
Yes you can have multiple Starbucks as long as each of the Starbucks has a unique site_code.
Is site_code case sensitive?
No. You won't be able to upload two Starbucks with site_code 'sb' for one and 'SB' for the other.
Can i delete the facility?
For now there is no way to delete a facility once it gets created. Can archive it.