How Not To Display A Row Depending On Other Rows.

Hello,
I am very new to SQL and ran into a problem using Access. I hope you can help me here.
The question is the following:
I have to tables:
Table 4x4: CommodityCode(string)/NeedofBU(high,low)
Table ASDBComplete: CommodityCode/Manufacturer/Rating(red,green,yellow)

What I want to get as a result is to display all ComodityCodes that have a 'red' rating and a 'high' NeedOfBU. So far no problem. But now there usually is more than one manufacturer for one CommodityCode. What I need now is that the CommodityCode is not displayed if there actually exist a Manufacturer with 'green' or 'yellow' rating.
How would you do that?
What I have so far is:

SELECT [4x4].[CommodityCode], [4x4].NeedofBU, ASDBComplete.CommodityCode, ASDBComplete.Rating, ASDBComplete.Manufacturer
FROM 4x4 LEFT JOIN ASDBComplete ON [4x4].[CommodityCode] = ASDBComplete.CommodityCode
WHERE ((([4x4].NeedofBU)="high") AND ((ASDBComplete.Rating)="red"));

But this gives me all the Commodities with red ratings. Even if there is a supplier with a green or yellow rating.

I would need somting like:
if exists 'commodityCode.XY with 'manufacuturer rating = green OR yellow' do not display commodityCode.xy

I really appreciate your help