Bug: The addition of 2 purchases of the same shares creates 2 lines in the Holding part

[sebfar9172]

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Bug description

The addition of 2 purchases of the same shares creates 2 lines in the Holding part.

To Reproduce

1. I have a free synthfinance plan that is fully consumed
2. I create a transaction to purchase a share A on a date D
3. I create a purchase transaction of the same share A on a D+1 date
4. I go to the Holdings section and I see 2 lines of share A

Expected behavior

A single line of share A with the history of points 1 and 2 above

Screenshots and/or recordings