Hello Everyone

I have a query related to manual journals in books i have entities in manual journal.. i am going to import csv file , but when i upload it , it show the error that "Journal number 926 already exists." and several error like it with different number.

i want to upload the data in same manual journal . like if my csv file contain 926 number so its data reflect in the 926 number which is already in manual journal.
Anyone please give me a suggestion.? how can i do it.?