Actual Behaviour:
when enable multi-language then new field language appear in print preview. when user print the document eg. sales order then language field is null - however client default was loaded as default in code/java.

Suggested change:
1 when user print the

• A.report - set language based on client default language (ad_client.AD_Language)

• B. document eg. sales order - set language based on partner document preference on bpartner or based on client language (fallback)

2. apply above logic - in report parameter selection window - before report started and preview opened.