How to separate the fields AppDomainName and ApplicationSource in timechart?

[lsy9891]

Hi
I have this query that counts the number of errors for two applications but I get the application names from different fields-one from appdomainname and one from application source. I want these two different applications to display as two different lines in my chart. I tried this but it only shows EcomSubscription as a bar chart?

earliest=-1d@d latest=@d host="NETAPPA*" sourcetype="WinEventLog:Application" AND (AppDomainName= EcomSubscription.* OR ApplicationSource="/order*") AND "ErrorGUID" | eval application =  AppDomainName.":".ApplicationSource | timechart span=1h count BY application

[Sukisen1981]

|eval application = if (isnotnull(AppDomainName),AppDomainName,ApplicationSource) |timechart <..rest of the stuff>