Version 6.42 (also tested in 6.41, which is where I first discovered the bug)
Short form:
Commercial freighter cannot use commercial jump tender.
Details:
Commercial freighter:
C-2 Galaxy class Superfreighter 43300 tons 165 Crew 917.8 BP TCS 866 TH 1800 EM 0
2078 km/s Armour 1-109 Shields 0-0 Sensors 1/1/0/0 Damage Control 1 PPV 0
Maintenance Capacity 13 MSP
Cargo 25000 Spare Berths 3
Schofield Aerospace Industries 300 EP Commercial Ion Drive (6) Power 300 Fuel Use 7.96% Armour 0 Exp 5%
Fuel Capacity 2,000,000 Litres Range 104.4 billion km (581 days at full power)
This ship is classed as a commercial vessel for maintenance purposes
Jump tender:
CJT Mosquito class Jump Tender 35650 tons 189 Crew 856.6 BP TCS 713 TH 900 EM 0
1262 km/s JR 2-50 Armour 1-96 Shields 0-0 Sensors 1/1/0/0 Damage Control 1 PPV 0
Maintenance Capacity 15 MSP
Spare Berths 3
Charlton Marine JC112K Commercial Jump Drive Max Ship Size 112500 tons Distance 50k km Squadron Size 2
Schofield Aerospace Industries 300 EP Commercial Ion Drive (3) Power 300 Fuel Use 7.96% Armour 0 Exp 5%
Fuel Capacity 500,000 Litres Range 31.7 billion km (290 days at full power)
This ship is classed as a commercial vessel for maintenance purposes
At first, I was attempting to send 3 ships through this jump point. When that failed, I tried to send them "squadron transit". That also failed. Now I am attempting to send just 1 ship through. It still fails.
I had thought that perhaps it was because I also had a military jump tender on the jump point. However, I have now flown that one off the point by an entire day. I still cannot send my commercial ship through.
Secondary issue:
It would appear that military ships can use commercial jump tenders. I have a non-jump capable military exploration ship that managed to travel through a jump point where I only had a commercial jump tender (same one as above).
Explorer ship:
GSV Copernicus class Gravitational Survey Vessel 7800 tons 200 Crew 875.8 BP TCS 156 TH 300 EM 0
1923 km/s Armour 1-35 Shields 0-0 Sensors 300/1/1/0 Damage Control 12 PPV 0
Annual Failure Rate: 0% IFR: 0% Maintenance Capacity 842 MSP
Spare Berths -3
Schofield Aerospace Industries 300 EP Commercial Ion Drive (1) Power 300 Fuel Use 7.96% Armour 0 Exp 5%
Fuel Capacity 1,000,000 Litres Range 289.9 billion km (1744 days at full power)
Rahman-Gough Thermal Sensor TH50-300 (1) Sensitivity 300 Detect Signature 1000: 300m km
Gravitational Survey Sensors (1) 1 Survey Points
This design is classed as a military vessel for maintenance purposes
NB: The Copernicus is currently being refit to the Copernicus II class, thus the -3 spare berths.