One of our Contractors performed a DESIGN CALCULATION In Accordance with European Code EN-13445, using PV Elite 2015, unknown Build.

I have no access to PV Elite file.
I am interested to understand their results and I need your help:

1. Which is the basis/ effect of the "Use Higher Longitudinal Stresses (Flag) Y" when the calculation is performed under EN-13445?

2. How are calculated the Longitudinal Allowable Stresses for Hydrotest tensile and Hydrotest Compressive Stress- second and fourth (last) columns with numerical values? (one may note that some values are over yield at test temperature, i.e. room temperature)
and
Which is the basis of "CHECKING" in the following sequence?

Longitudinal Allowable Stresses
| | | Hydrotest | | Hydrotest |
From|To | Tensile | Tensile | Compressive | Compressive |
| N./mm² | N./mm² | N./mm² | N./mm² |
-------------------------------------------------------------------
10| 20| 174.637 | 297.012 | -131.717 | -222.962 |
20| Legs| 174.637 | 297.012 | -131.717 | -222.962 |
Legs| 30| 174.637 | 297.012 | -131.717 | -222.962 |
30| 40| 174.559 | 264.611 | -131.661 | -200.252 |
40| 50| 174.559 | 264.611 | -140.433 | -214.538 |

Allowable Stresses = Rm/20 *cs = 390 * 0.8 = 312 N./mm

CHECKING
Allowable Stresses > Hidrotest tensile
312 N./mm² > 297.12 N./mm²

3. Are the results shown in point 2 dependent on the Flag Y in Point 1?

Thank you.