more than 11 itemtypes in itemtype determination

Hallo experts,

for our Opportunity configuration we have 10 different entries for Itemtypegroup in our Material master

and 17 different item types.

We need such a lot item types for our processing.

We understand, we have to configure for a specific Ordertype for each

itemtypegroup an entry in the itemtype determination,

But how can we allow more than 11 itemtypes per itemtypegroup ?

Is there a badi or any other way to extend the configuration to have more itemtypes available ?

Thank you for any hint

Best Regards

Frank