How to generate ewaybill under works contract

Dear All,
My company taking works contract project which consist supply and labour both in one invoice and under works contract GST rate are CGST 9% & SGST 9% but my client asking for ewaybill my question is how it is possible to generate ewaybill bcz if I generate then my machine has 28% GST and it will not be match with invoice value so in that case what should I do and how do I generate ewaybill plz suggest.

Regards
Samir Shaikh