NSD 7.1

In the AMIE customised mappings section of the Administrator guide the following note is made:

Note that this only affects systems that support the feature of manually editing the Item Number field (when the Setup > Privileges> System> Edit Item Numbers option is enabled). In order to use editable Item numbers when AMIE is enabled, the 'Edit Asset Mgmt IDs' option must also be set to "Yes".

Where is the Edit Asset Mgmt IDs option located?