Hi Oisin,
To answer your questions...
What is the SAP BASIS and Kernel of the WEBGUI system?
SAP BASIS is 7.31 sp 6. Kernel is 7.21 sp 321. We could update the kernel, but not basis right now.
Does issue with transaction ME54N only occur when you call it from the UWL?
Yes
Does it happen when called from the WEBGUI directly?
No, the attachment list load the documents fine. It just seems to be through the portal UWL.
What is the JVM and Browser version you use?
I was testing using IE 11.0.14 (KB3003057) and Chrome 39.0.2171.71. As for a JVM, I only have jre7 installed on my machine.
I tested in the WEBGUI and no problem at all. So we think it is an issue with the portal.
Cheers,
Kevin