UOM not showing in Item Master, when standard conversion is not defined.

Hi Gurus,

I have defined 3 UOM under Quantity class.

1. Case (Primary)
2. Bottle
3. Each (Base Unit)
4. Keg

Case 1 )

1. I have defined only standard conversion for Case to Each, Bottle to Each, Keg to Each
2. Created a New item XXX, with UOM Conversion as Item Specific and Primary UOM as Case.
3. Defined item specific conversion for XXX, Case = 120 each & Bottle = 12 each
4. End-Dated the Case to Each standard conversion.
5. When enter the sales order I am able to select Case UOM.
6. When I am creating a new item I am not able to select Case. (UOM not showing in Item Master, when standard conversion is not defined).