Sign off limits for Purchase Requests are set on the Purchase Request type itself, rather than on the user's member record. This is different to the sign off limit for Purchase Invoice Register (PIR).
To set a sign off limit for a Purchase Request:
Log into FocalPoint Administrator
Click System Options, Purchasing, Purchase Requests Setup
Select the relevant request type.
Click Usage
In the Sign Off Value column, enter the required value
Click OK to save changes
Repeat for any other Purchase Request types.