DTW: Unknown error -1005!65171

Hello Experts,

I created an UDO from a Documents and Document Rows table. I am now trying to upload data into SAP using DTW.

I generated the template using DTW too but I cannot add any data: I keep getting the following error: Unknown error -1005!65171

See the header Excel below:

I have seen this question asked before and during my UDO registration, I did not include any spaces or brackets.

I am using SAP version 9.1 PL 6

Any solution will be much appreciated?

Kind regards,

Kinyanjui.