Alignment Selection
When calling the command 
CSarjeta,
C3DCALC if the gutter or the structure has not
an alignment of reference, by clicking the column REFALIN, this screen will appear:
it, choose the desired alignment.
On the screen you can select the alignment, the name then clicking the OK button, or by double-clicking on the name.
If you are not sure which alignment you select, you can still click the button 
To select directly on the screen.
In this case, click the desired alignment and it will be selected in the screen above.
Finally click OK.