Is there any documents available to have understanding of SPEL code in service desk, pls help.
Unfortunately spel customization is not something supported by CA, thus we have not published any type of documentation regarding it at this point. If there is something specific you are looking to do with requires spelcode, you may post that here, and folks on the community who have gotten it to work (or something similar) may respond and share their code and ideas with you.
There is a doc created by Gutis in the Documents tab of this forum: https://communities.ca.com/docs/DOC-231158970
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