Although I didn't get a chance to work with Crystal Reports with ERP LN... I found out that it is possible.
Please check the below link:
If you are planning to newly implement Crystal Report with your Infor LN system then I would suggest you to check "Infor ERP LN plugin for MS SSRS" which is a better reporting tool and has a very good integration with ERP LN.
@Admin- Can you please transfer this blog to the proper Thread.