Title and Caption to be read from metadata by Digikam

[francois.pupier at free.fr]

Hello everybody,
“Title” and “Caption” tags can be written or modified by user in the righside tab, but they seem not be read by Digikam in the IPTC or XMP metadata (like IPTC:Title or XMP:Caption). 
I have 3 000 pictures with filled metadatas and I would like that Digikam read the metadata and store them in the database, to avoid to having to copy them manually in the rightside tab.
Is there a solution to do it, for example in the settings, or configuration files ?
Thank you very much for your help.