The Problem
During and after an upgrade to ECC 740 SP7 (on HANA), we found that when logged on in the English language, the type-ahead functionality in SE38 and SE37 works perfectly. However, when logged on in Dutch (which is the standard Logon language for this particular company we upgraded), the type-ahead function doesn't work.
Logged on in English
Logged on in Dutch
Analysis of the problem
I checked the search help that has been assigned to the SE38 and found that the problem lies in the definition of the Search Help.
Search Help uses SY-LANGU als default language.
The View is based on a CDS-view
The CDS-view has defined that only language E and D are supported.
(In creating the picture below, I mixed up the CDS view for SE38 and view selection conditions for SE37, but they are basically the same)
Solution
I was doubting if I should report this as an issue at SAP via OSS. For the time being, the only solution is to log on in E or D, or modify the CDS-view.