Please check if both purchasers has same roles.
Team Purchasing works as below
Use
As of SAP Supplier Relationship Management (SAP SRM) 7.0, you can use the team purchasing function. This function allows users to take a team shopping cart over from another user. As a prerequisite for a user to take over someone else’s team shopping cart, either the original requester or an administrator must nominate the user as a purchasing substitute.
You can use this function, for example, when employees are ill or on leave for a period of time, when employees leave the company, or when employees work in shifts and you want the purchasing process to continue without interruption.
Working with Team Shopping Carts
When creating or changing a shopping cart, the requester can then select a checkbox that marks the shopping cart as a team shopping cart to allow his purchasing substitutes to process the cart. However, the task of managing purchasing substitutes can also be carried out centrally by a system administrator, depending on the settings you make in Customizing.
Once a substitute has taken over a team shopping cart, he can perform the same activities as the original requester before the take-over. For example, he can edit the team shopping cart and create related confirmations.
Information about who has taken over a shopping cart from another user and has processed it is displayed on the General Data area of the shopping cart under Document Changes: Display.
Finding Team Shopping Carts
The search mechanisms provided in the SAP NetWeaver Portal (simple search, advanced search, Personal Objects Worklist (POWL) search) also support the team purchasing function. Employees can use a predefinded POWL query for team shopping carts which allows them to find all team shopping carts and refine the search to find carts created by specific users.
Technical Requirements
You have to use the process-controlled workflow framework to use team purchasing. Team purchasing is not available with the application-controlled workflow framework.
Customizing
To allow users to create team shopping carts, you must enable the team purchasing function in Customizing for SAP Supplier Relationship Management under SRM Server Cross-Application Basic Settings Define Transaction Types, for the transaction type Shopping Cart (SHC). In this customizing activity, you can also decide whether all users or only administrators can define substitutes, and whether also members of different organizational units can substitute each other.
for other details check Release notes - RN_SRM70_SP06_EN
Regards,
Raghu