Haroon
"Landing Ltd MTOW = 137000
ZFW Ltd MTOW = 137400
Thus MTOW Limit = 137000"
.. doesn't make a lot of sense, and I should have resisted jumping in because I'm not an expert on A310 and I'm not going to become one.
But I do know that from a 4000m runway at 25 deg C the maximum permissible TOW is not 137t. Almost certainly 157t.
You'd better have another look at those tables.