MDG-C : cannot fetch UI configuration BS_OVP_BP_ALL

Hi Gurus

We are implementing MDG-C 6.1 in co-deploy mode.

The system is full standard but I cannot make appear UI config BS_OVP_BP_ALL to create/process BPs.

I have made the package BS_OVP_BP_ALL visibl; I have hidden BS_OVP_BP.

Users are assigned to data model BP in SU01 personalization.

I applied BC sets to get the following CR types :

CUST1P1

CUST2P1

CUST5P1

CUST6P1

WF steps are assigned to processors for all those CR types.

I did everything according to the config guide but it keeps raising the error message : "No change request types available for business activity"

It seems it wants business activity CLP1 but I want to use Business activity CUP1.

Are there additional config steps? Do I need to specify BS_OVP_BP_ALL somewhere?

Many thanks in advance