Error in standard order

Hi Experts,

When i am manually scheduling a Standard order for couple of times I am getting the Loading date after Delivery date.

I could find it out for couple of sales order with "OR" type.

For reference below is the screen shot for the same. I have checked the settings every thing is fine.

Please let me know if any OSS note available for it or how do i find why system is behaving like this.

Early reply Appreciated...

Thanks in Advance!!!!!!