Optimizer not loading the entire MPS file

At first glance the file looks at least strange. For example you have these lines (line numbers to the left of the colon):

42945485:    x1000000  e192274        -0.3953
42945486:    x1000000  e63       -77.16725385
42945487:    x1000000  e104258              1
42945488:    x1000000  e192274        -0.3953
42945489:    x1000000  e63       -77.16725385
42945490:    x1000000  e104259              1
42945491:    x1000000  e192274        -0.3953
110922508: UP bnd       x1000000           182
110922509: UP bnd       x1000000           182
110922510: UP bnd       x1000000           182
110922511: UP bnd       x1000000           182
110922512: UP bnd       x1000000           182
110922513: UP bnd       x1000000           182

So either this is highly repetitive or the column names got truncated to 8 characters.

Moreover, Xpress issues this warning

?18 Error: Bound conflict for column x1573539 : 69.5917 > 42

And indeed the file says

102781311: FX bnd       x1573539  69.591674194
116580618: UP bnd       x1573539  268.02631579
116580619: UP bnd       x1573539  268.02631579
116580620: UP bnd       x1573539  268.02631579
116580621: UP bnd       x1573539  268.02631579
116580622: UP bnd       x1573539  268.02631579
116580623: UP bnd       x1573539  268.02631579
116580624: UP bnd       x1573539  268.02631579
116580625: UP bnd       x1573539            42
116580626: UP bnd       x1573539            42
116580627: UP bnd       x1573539            42

In other words, many different bounds are specified for x1573539 in the MPS file. The first line fixes the variable to 69.591674194. Then a bunch of lines sets upper bound to 268.02631579 and then another bunch of lines sets the upper bound to 42.

This smells a lot like a problem with the MPS export of GAMS. Is there maybe an option you have to give when you have a lot of variables so that names do not get truncated to 8 characters? Could you check with GAMS support people? The MPS file definitely looks unexpected.