Solution : https://service.sap.com/sap/support/notes/485455 (SAP Service marketplace login required)
Key words :
error message 'f8y bad tst0a entry, codepages show status 'internal error, convert individual 9xxx code pages, customer code page naming conventions, select goto -> cache control, customer defined code pages, sap-specific code pages, neccessary support package levels, reusable code page segments, code pages defined
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