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displays ecr locked how do i unlock ?

the ecr is locked a little kid was pressing the buttons b4 this message was displayed. IT IS A DATECS DP-50
david wanyama, January 2013
This is a very rare machine and I haven't worked with one but it might mean you have to sign on. If the little kid signed you out then it will require a sign on. Check your manual to see if it uses clerk or cashier sign on

Registerman, January 2013