Issue : "decide wether" won't recognize kind

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Hello, I have an issue, with “decide whether” not recognizing a custom kind :

Storage is kind of thing. 
  Storage has a good called content. The content of storage usually is vide.
  Storage has a number called quantity. The quantity usually is 0.
  Storage has a number called price. The price usually is 0. 
The description of storage  is "Some storage containing [quantity] [content] at [price]$ each".

To decide whether (stuff - a storage) can sell (quantity - a number) of (good - a good):
	if content of stuff is good and quantity of stuff >= quantity, decide yes;
	decide no;

Doing this sends me the following error message :

In ‘To decide whether (stuff - a storage) can sell (quantity - a number) of (good - a good)’ , the text ‘storage’ after the hyphen should tell me what kind of value goes here (like ‘a number’, or ‘a vehicle’), but this is not a kind: it does describe something I can understand, but not something which can then be used as a value. (It would be allowed in low-level, so-called ‘inline’ phrase definitions, but not in a standard phrase definition like this one.)

While, if I change the code as bellow, it compile correctly.

Storage is kind of thing. 
  Storage has a good called content. The content of storage usually is vide.
  Storage has a number called quantity. The quantity usually is 0.
  Storage has a number called price. The price usually is 0. 
The description of storage  is "Some storage containing [quantity] [content] at [price]$ each".

StoreIn is a king of storage.

To decide whether (stuff - a storein) can sell (quantity - a number) of (good - a good):
	if content of stuff is good and quantity of stuff >= quantity, decide yes;
	decide no;

Does anyone know why ?

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Well, I have done test, and changing the word “storage” to “stock” seemed to solve it. Maybe it is an inform bug, or something I don’t understand…

I had opened that other thread related to that issue.