I am working on PI7.3 Java stack now.
The requirement is :
There is a field "A" in the target message.
Value of field A
For 1st message PO1
For 2nd message PO2
For 3rd message PO3
For 4th message PO4
Like this the Output need to be increased by 1 for every message.Suppose today 100 message went,so from tomorrow field A value shud start from PO101.So it should always remember what was the last value passed.