Use the Function field for creditor identifier
(grafted from 5f35c6dee7a9ab849b597741e667d133c6fd1cfe)

--HG--
branch : 3.2
extra : source : 5f35c6dee7a9ab849b597741e667d133c6fd1cfe
Some banks don't allow multi-line values in XML

issue3880
review11261002
(grafted from 3d3e65fc43df84a572c555906a94432f6edc6f43)

--HG--
branch : 3.2
extra : source : 3d3e65fc43df84a572c555906a94432f6edc6f43