I never heard about this. As far as I know you need to be Chinese to buy A-Shares. Having RMB or being paid in RMB is irrelevant since even a tourist can open a bank account in China or HK.
I think if you present your income tax receipts (your money was earned in China), as long as the money is earned in China. there are all sorts of problems that go away with income tax receipts since not any tourist can get a job and earn money domestically.
Please elaborate in this.