So from what I understand you have a NW 7.4 Java system you upgraded from NW 7.3. I am assuming this is standalone Java stack.
you can technically put CRM Java 703 as an add-on to this but it will be tricky. I think the best way to do that will be use Maint optimizer to select appropriate components. run an Maint optimizer transaction and see if it shows up SAP CRM as add-on to this. If it does, you should be able to put in all correct components along with appropriate add-ons.
doing it manually, you will have to pick all relevant CRM java components and still I think it will be tricky to get it working. Honestly I have not done it.
Easiest way to do it of-course will be to install a standalone Java stack system with CRM components to start with but then of-course you will end up with a separate java stack. We did the same and now we have 6 java stack business systems to serve various business add-ons. I would love to consolidate them to fewer but too lazy to put in the efforts.
Do update the message with your findings, it will be interesting to know how it worked. Maybe it encourages me to take the initiative.
hope this helped
regards
Yogesh
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