Solution : https://service.sap.com/sap/support/notes/627767 (SAP Service marketplace login required)
Key words :
wage type /703 - ee social security tax ytd, /603 - ee social security tax ytd amount, internal process reflects matching entries, terms adjust namc reportable, negative taxable amounts, tcrt <z1>prior</>, fica taxes calculated, negative taxable adjustment, ytd values, type 'adjt'
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