Knowledge Management

Question:
Greetings SD gurus,
I have a question regarding Condition Types in the Sales Order Screen. The business requires that certain specific Condition Types and their values be hidden from the sales order processing screen. I've tried the following alternatives but none seems to work:
1) Tried to use screen variants but I end up hiding whole columns from the condition screen instead of hiding rows of a specific condition type.
2) Found some User-exits, but I can't find the one that is activated upon opening of the Condition Screen of the Order.
3) I might try to find something through authorizations.
Thanks
Bas
Answer:
Notes 105621 and related notes.