Error message
The 'attr.PIM.name#de-DE' (Artikelname (Shop)) attribute must have a maximum of 255 characters.
What does this error mean?
Your product "title" exceeds the 255-character limit set by the marketplace.
How to solve it
Choose one of the following methods, then perform a manual full push to send the updates:
Option 1: Update your source catalog (Recommended). Shorten the titles to 255 characters or less directly in your source category.
Option 2: Use Lengow. Go to the Attributes Mapping page and apply the SMARTTRUNC function to the "title" attribute, setting the limit to 255 to automatically shorten them.