How come "business account" credit cards don't help your credit?

[Ms_Margaret]

I have a business credit card with a high credit limit, but this account does not show up on credit reports from all three crediting agencies. I asked the card issuer why this is, and they tell me that it will only show up if i have negative history (late payments, bankruptcy) but it does not show my on time payments neither there is any sign that i have this available credit line in my name. I am trying to build good credit history, but this doesn't even add to the evaluation of it. Any one know why this is?