Hi,
Sap Note 1707273 is valid for NW 7.1 and above system and it seems
you are running solman 7.1 on NW 7.01 system so this note is not
valid for you.
Can you please refer the following note:
1326081 SLD import error: "Posted content length exceeds limit"
and set "MaxUploadSizeMB" to a hgher value. It will resolve your
issue.
Regards,
Aidan