Concerto for flute and orchestra in D Major, No 2 (K 314/285d)

W.A.Mozart flute concerto in D Major (K 314/285d) was composed in early 1778 during his stay in Mannheim.
During that winter Wolfgang was on a tour for the first time without his father, Leopold. However, his mother was with him, pursuing luck in finding a post for a young composer at the electoral court in Mannheim or in Paris later that year.
While in Mannheim, young Mozart met local orchestra's flutist, Johann Baptist Wendling who introduced him to the Ferdinand De Jean, the surgeon with the Dutch East India Company and amateur flutist who commissioned him to compose "three short, simple concertos and a couple of quartets for the flute".
From this commission came two flute concertos: in G and D Major, as well as a pair of quartets for flute and strings. The third concerto was never written.
Only G Major concerto could be considered as an original composition since the D major concerto as it turned out later was a reworking of his Oboe Concerto. Obviously, Mozart did this to quickly supply at least two of the three concertos to fulfill his obligations.
However, Ferdinand de Jean was dissatisfied and left for Paris after paid him less than half the fee they agreed upon since Mozart didn't deliver "three short, simple concertos". Perhaps these concertos were too long and too technically challenging for an amateur flutist.
Additionally, it's worth to know the circumstances under which 22 years old Mozart composed these Concertos, as he wrote to his father:
"I never have a single quiet hour here. I can only compose at night. Besides, I'm not always in the mood for working... You know that I become quite powerless whenever I am obliged to write for an instrument which I cannot bear."
Mozart's attitude towards flute as an instrument most likely was formed due its popularity among mediocre amateurs and dilettantes at that time, as Joseph Frank narrates in his Reminiscences (Prutz, Deutch. Mus., II., p.28.): "Once when we were talking of instruments, Mozart said that he detested the harp and the flute". Most likely it was stated the same year, months later in Paris, when receiving commission to write a concerto for flute and harp from the Due de Guines, amateur flutist and his daughter who played harp.

Some parts of the D Major concerto have survived in a copyist's manuscript dating from the 18th century.