it was my fault an i have found the problem. In the Request, we had more than 100 Orders. But at this time, I doesn't know about a query limit of 100 orders.
No I used the pagination like this to solve my problem.
Dim sOrderlist As New StringCollection
apicall.Pagination = New PaginationType
apicall.Pagination.PageNumberSpecified = True
apicall.Pagination.PageNumber = iPage
Dim orders As OrderTypeCollection = apicall.GetOrders(fltr, TradingRoleCodeType.Seller, OrderStatusCodeType.All)In a Loop, I check for apicall.HasMoreOrders if the loop runs a time again and set the Page +1. I hope this could help other persons with the same problem :)
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