flow service pub.monitor.process.instance:getInstanceList

Hi,

I use the flow service getInstanceList with input customID.
I created several customID. For example:
20000
00002
400001
123456
When I put customID = 0000 on input, the service returns all the instances that contain ‘0000’ which means [20000, 00002,400001]. That is not like what they say in the description << customID String Optional. The full, user-defined ID for the process instances that you want retrieved. User-defined IDs are assigned by executing the pub.prt.log:logCustomID service.>>
I expected having no results.

Can anyone have an explanation ?