With thanks to Manfred Jeusfeld :
The CEURVOLACRONYM should not be be compound. It should have the form
"shortlabel YYYY"
For dual workshop proceedings, it could have the form
WS1-WS2 YYYY
For multi-workshop proceedings it could have the form
ConfName-JWP YYY
or ConfName-Companion YYYY
With thanks to Manfred Jeusfeld :
The CEURVOLACRONYM should not be be compound. It should have the form
"shortlabel YYYY"
For dual workshop proceedings, it could have the form
WS1-WS2 YYYY
For multi-workshop proceedings it could have the form
ConfName-JWP YYY
or ConfName-Companion YYYY