Dynamically set metadata during submission in DSpace 6.3

[kpet]

Hello,

I have a DSpace 6.3 installed on a linux machine, using tomcat 9, jre 1.8, ant 1.10 and maven 3.3.9.

I want to be able to dynamically set a custom metadata field that exists in the "local" schema during the submission process, specifically the 'Describe' step.

The way I understand it, I must edit the DescribeStep.java class and add the value there.

In pseudo-code, I want to do:

item.myMetadataField = item.handle + mySuffix;

Can anyone provide me with an example of how to achieve this result?

Any help would be greatly appreciated!