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errors in calculated concatenated unique ids

Question asked by LBerni@slco.org_slco on Sep 19, 2018
Latest reply on Sep 19, 2018 by JTedrick-esristaff

We are generating unique sample id's based on the following calculation: 

concat('MA ',once(format-date(now(), '%Y%m%d %H%M%S%3')))

 

It seemed to have been working just fine, until I noticed a couple of funky ids, where the concatenated "MA" is being added multiple times!  (see screenshot).  Any idea what's going on here? 

 

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