Try like this:
LOOP AT tabexcel.
CASE tabexcel-col.
WHEN '0001'.
ztable-field1 = tabexcel-value.
WHEN '0002'.
ztable-field2 = tabexcel-value.
WHEN '0003'.
ztable-field3 = tabexcel-value.
...
ENDCASE.
INSERT ztable.
ENDLOOP.
Try like this:
LOOP AT tabexcel.
CASE tabexcel-col.
WHEN '0001'.
ztable-field1 = tabexcel-value.
WHEN '0002'.
ztable-field2 = tabexcel-value.
WHEN '0003'.
ztable-field3 = tabexcel-value.
...
ENDCASE.
INSERT ztable.
ENDLOOP.