My friend has a problem to send Verpflichtungserklärung (VPE) to me. It seems the immigration office of her town wants more than only blocking 5000 Euros. They want her to prove she has a home. She is staying at her friend now and her lease for new flat is for July. But my interview for visa is on late June. They said she must be registered at the municipal administration which cannot happen in two weeks. So I think I should ask her to write me an informal invitation letter to present it to the embassy.
The problem is we don't know how to write it. Please let me know if there is a way to get VPE with current situation and if its not possible how should we write invitation letter, a sample would help.