Greyed-out Invoice option on Project Sales orders in Dynamics AX – May 9, Stoneridge Software, #MSDynAX

Have you ever seen a greyed-out invoice option on a Project Sales Order in Dynamics AX? I ran across this predicament while at a customer site.   We had posted the packing slip to ship and was were ready to post the invoice. The invoice button was greyed-out like the screen below.  What to do?  How can I get around this?

Being a relative newcomer to projects, I searched for answers and...

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