How to set Reservation Relevance/Generation of Purchase Requisition updatable

Hi all,

our PS customizing is showing Network parameter Reservation Relevance/Generation of Purchase Requisition as un-updatable and set to 3-Immediately.

We have found in SPRO / Project System / Structures / Operative Structures... / Network / Setting for Network / Network Default

that our default option has been set to 3 -Immediately and that the Network is created as already Released.

Now we need to prevent PurReq creation until the project PrdOrd haven't been completely entered. Then, once the Engineering / Planning depts will complete the finish product definition we want to let the user to change the Newtork parameter to 3- Immediately.

Summarizing we want to find out how to update our Network customizing in order to have:

1. the parameter set to 3-Immedialtey as default

AND

2. UPDATABLE by the user in order to use it to prevent PR when required.

Thank you in advance for your help.

Silvia