st: Type Miismatch error after Encode in time series

["Michael Crain" <michaelcrain@hotmail.com>]

I am getting a Type Mismatch error that I cannot solve despite spending a 
lot of time reading various resources.

I obtained a data set with one field that was a string.  I applied Encode to 
change the string field (containing alpha characters) to a (general) numeric 
field by doing the following:
encode custormername, gen(cust_id)

This is panel data so I defined the data set as time series with TSSET:
tsset cust_id week

The time series commands performed fine at that point such as ARIMA using 
BYSORT cust_id, which successfully resulted the arima results by cust_id 
over the entire data set such as:
bysort  cust_id: arima  saleamt, ar(1 52), if tin(2002w1, 2004w35)

However, I want to do TS commands for a specific cust_id and entered:
arima  saleamt, ar(1 52), if cust_id=="XYZ COMPANY"

But I get the Type Mismatch r(109) error message, whcih I just cannot solve.

Any hekp is very appreciated.  Thank you.

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