Create billing document" is not allowed(Message no. BS007)

hi every body ,

i asked for scenario service contract if i create sales order type (sc)and assign equipment and create service order for this equipment and assign contract if i want to billing this use dp90 this error appear

Create billing document" is not allowed (SDI 40000248/10)

Message no. BS007

Diagnosis

The current status of object 'SDI 40000248/10' prohibits business transaction 'Create billing document' ('SDIN').

Procedure

To process business transaction 'Create billing document', you first have to change the status of object 'SDI 40000248/10' to allow the transaction 'Create billing document'.

This gives you an overview of the system and user statuses that affect the transaction. A transaction can only be executed if there is at least one status that allows it and there is no status that forbids it.