Jar file has no source attachment
I've created a custom B2B application using the step-by-step guide, but am having trouble viewing the Java code within the SAP delivered classes. For example, when I try to look up the code within the ShowProductDetailAction.class, I get the following message:
The jar file sap.comcrmisaisacoredefault.jar has no source attachment.
You can attach the source by clicking Attach Source below.
Where can I find the source for the jar files? I am new to the ISA / NWDI world, so any help would be greatly appreciated.