cannit fill maestro 12 sw planter when kuhn pf1500 is not on front

[chaskuchar1]

using small fendt when spraying with mega 2200 sprayer. pf1500 was full when dropped until next spraying. then planting cotton on cultivated ground and when planter was empty tryed to refill it. filling would not take place until I put the pf1500 on the front of the fendt. then filled planter and am proceeding to plant... looked at the log file and saw four errors, one about mod, and then thought I should put the pf1500 on the fendt. then game works again. chas