Change in the extract strucure what will happen to psa data

Dear All,

one doubt

we have upgraded our R3 4.7 to ECC

so what happend is, the data sources are getting enhnaced with new fileds

so once the new fields are there in the data source then i need to replicate the data source right

my doubt is what happens to PSA...........its a production server...

Do i need to delete the data?

regards

venu