Steps to reproduce:

1. Config a jmx discovery rule for output of PCF Jmx Bridge.
2. Create a item prototypes as : jmx{#JMXOBJ},{#JMXATTR}
3. Config another jmx discovery for another object.
4. Create a item prototypes fail as :jmx{#JMXOBJ},{#JMXATTR}   

Result:
Can not create same macros  in second discovery item prototype.

But there is different jmx object to discovery in second rule
Expected:
Can use same macros in different discovery prototype.