Do I have to file a 1099 Misc for self employment or can I enter this as cash income and forego the 1099?

I have a 1099 Misc for self employment. The payer issued it with their federal id number as only the last four digits of their SSN visible and the rest of the numbers are x'd out (xxx-xx-####). The payer will not give their full SSN as they state that they have never been required to provide the full number before. Turbo tax requires the full number to be entered. I have been advised to simply skip the 1099 Misc and enter the amount as cash income. Can I simply skip the 1099 Misc as long as I report it as cash or am I required to enter it since I received it?