SAP Message S>214 - Non-7-bit ASCII character(s) in line &1 (see long text)

Diagnosis
The source code contains (at least one) non-7-bit ASCII character inline &V1&. These characters can cause problems in the customer system(in combination with the system code page).
The error occurred when the the following template was edited: &V2& &V3&V4.

Procedure
Only use 7-bit ASCII characters, even in comments.