Even though Output item Form language is German(GE) when Form Country/Region is Austria(AT), form template language is displayed in Austrian German(e.g January as Janner). You want to have form template content in proper German.
S/4HANA Cloud All versions
Reproducing the Issue
1. Display Output requests from a certain Business Application document output.
2. Select Form Language as German and Form Country/Region as Austria(AT).
3. Display Output item document. Form template is displayed in Austrian German.
There are two options to avoid this system behavior.
1. Manually change the FormTemplateCountry from AT to DE before the output.
2. Create/modify the custom form template and adjust the locale there (e.g. via scripting). Likely this is more a consulting task.
German, Austrian, Janner, January, locale, Form Language, Form Country/Region , KBA , SD-BIL-GF-OC-2CL , Output Control Billing (Public Cloud) , CA-GTF-OC , SAP S/4HANA output management , How To
SAP S/4HANA Cloud all versions