Taxation of the purchase of an agricultural field after the partition auction
A and B bought a farmstead and several meadows in 2011, each for 1/2.
One meadow and the green area of the farmstead were officially self-managed. A and B received operating premium, compensatory allowance, and VNP by having a business number and registering with the AELF.
The other meadows were assigned to leasing and renting (V&V).
After 3 years, B terminated the joint ownership and applied for partition auction (TV) to dissolve the community. A bought a meadow for agriculture (LW) among other things. A also had to pay property transfer tax only for the newly acquired 1/2 share.
A third party bought the farmstead.
1) The tax office now considers A's purchase of the agricultural land as if it had been bought by a stranger. They want to fully tax the profit that A caused himself (the profit only arose from the purchase "from oneself"). Is this permissible?
2) In order to apply for TV, the GbR must be terminated beforehand! It is now questionable whether the agricultural operation was already terminated before the TV.
3) After the purchase, A was able to TAKE OVER the ongoing subsidies from the Office for Agriculture (AELF) with a new business number. So the question arises here as well whether it was an abandonment of the business? Or whether A actually continued the operation, as the meadow was a significant part of the agricultural operation?
Which of these considerations is correct and where can it be read how this sale is to be taxed?