Concatenate unique id

so I had a working concatenate unique id.

today I go on and now get a error message.
Expressions in schema ‘MASTER LOG_Schema’ have a circular definition. Check app formulas and initial values for column ‘ID’

the formula is working, so I’m lost why all of the sudden i have this message.

CONCATENATE([STOCK #],[VIN #],LEFT([First Name], 2) & LEFT([Last Name], 2))

Roger, did you figure this issue out? I just ran into the same issue today and don’t know what happened.

@Roger_Dalomba, @Jason_Measures:

A circular definition means the an expression in one column references another column which itself references the first column. Imagine if the expression for column A was [column B] and the expression for column was [column A]. It won’t work.

what I don’t understand…It’s been working for a while now.
and it just stops working??? doesn’t make sense

none of those column reference my ID

Please contact support@appsheet.com for further help. Somebody there will be able to look at your app configuration to find out what’s going on.