Related to field not populating when importing notes

Hi all,

I am attempting to import a series of notes from a .csv file from Excel with the intention that the notes will be visable under a series of different accounts. All of the fields are mapping correctly except the 'related to' field.

I've tried mapping the 'related to' field to the unique account name, and the 'related to ID' field to the unique account sugar ID number.

I am using SugarCRM Professional, Version 7.2.1 (Build 1096).

This is the first time I've attempted to import notes. I've imported accounts many times in the past with no issues.

Any help would me much appreciated!