Here is a link to Heinrich Ehrers crash site
http://www.aircrewremembrancesociety.com/luft1945/Ehrler.html
just sroll down.
Schuck confirms that Ehrler was KIA on 4th of April 1945. When he and Weissenberger signed the official death documents, they did not look if the date written on the paper (6th of April) was correct. At those times anyway no combat pilot had the time or was interested to give back the document to the Gefechtsstand for correcting an error in the date.
To the date, 4th of April fits a story of a ground crew member, an Oberfeldwebel of Stab/JG 7: It was obvious that Ehrler was a broken man after he had been accused to be responsible for the sinking of the "Tirpitz". Although he was innocent for this tragedy he was sentenced and imprisoned in Aakershus/Norway. Released to front probation he immediately went to his friend Theo Weissenberger, Kommodore of JG 7. On 27th of February 1945 he arrived at Brandenburg-Briest (see also Boehme, Jagdgeschwader 7). In the following weeks Ehrler fell more and more in depressions and could not get over the disgrace he had to endure and experienced. Before his take-off on 4th of April Ehrler gave a silver ring to the Oberfeldwebel with the words: "you have always been my true and reliable armourer. Take this ring, I don't need him anymore..." After Ehrers death the Oberfeldwebel knew what he had wanted to tell him. It is said that this ring was a present from Weissenberger to Ehrler. Inside are shown the date of arrival 27.2.1945 and the initials H.E. - no other pilot of JG 7 had the same initials H.E. The top shows the crest of JG 7, see attached photo.
All the best,
Horst