I spoke with a representative at Lacerte/Intuit ….you are getting this message because the IRS
has extended a law and has some forms on hold. These forms may change the outcome determined by the IRS for your client. You can bypass the error in diagnostics but your client may receive a notice of change according to how the law gets extended for 2018. Bypassing this diagnostic does not mean the tax filing is final or will be accepted.
Go to e-file tab, scroll down to e-file support tools, then carefully scroll down to disable e-file error and this will enable you to e-file, however, again...you may not have the return accepted due to draft of forms and a letter may be generated that it was not accepted and to wait for the update to come out.