Why?

[Cole Bush]

Why the fieldpost number was written off in lots of SB in late war (1944-1945 as i see) ? because the number of the unit was changed?

[hucks216]

As a security measure.

[JUNGCO]

In 1944 a regulation came out about not using the Feldpostnummer and instead using an open address in the Soldbuch. This was very confusing, since the FPN was originally used for security reasons. Some units blacked out all the FPN's and others didn't.
Jeff

[Cole Bush]

got it! thank you !!