There is no monetary limit on interstate job works.
If you are sending goods out of state, then you have to compulsory generate E-way bill regardless of invoice value.
But for local intra-state limit is Rs. 50,000 even for job works.
I have no idea how the officer said Rs. 1,000.
As per me he tried to harass. I could be wrong, but if any other learned member can share his opinion, that would be great.