Sales Orders are not going into Credit Hold

Hi,

We have set up the credit check for a customer ( Credit Limit=10.00 , Credit check level=Customer, Exempt from credit hold=Not checked, Credit check Hold code in Sales order version=CH).

Not sure how the blank allowable % affect credit check. I see the documents with zero allowable percent. But seems blank is not same zero.

We were expecting the sales orders will go to credit hold with this set up, but they are not.

Below screens are Order Hold Information (P42090) and Account Status Summary (P03B218). Pls let me know if you want me to provide any particular details. Thanks in advance for your help.