fix: Previous document currency getting overridden (backport #29404)

[mergify]

This is an automatic backport of pull request #29404 done by Mergify.

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[codecov]

Codecov Report

Merging #29434 (b72cdb4) into develop (108d104) will increase coverage by 0.03%.
The diff coverage is 94.28%.

@@             Coverage Diff             @@
##           develop   #29434      +/-   ##
===========================================
+ Coverage    57.99%   58.02%   +0.03%     
===========================================
  Files         1091     1091              
  Lines        67868    67881      +13     
===========================================
+ Hits         39357    39390      +33     
+ Misses       28511    28491      -20     

Impacted Files	Coverage Δ
.../hr/doctype/leave_application/leave_application.py	73.82% <93.93%> (+0.95%)	⬆️
erpnext/accounts/party.py	77.45% <100.00%> (ø)
erpnext/tests/utils.py	93.24% <100.00%> (+0.09%)	⬆️
...work_order_stock_report/work_order_stock_report.py	50.00% <0.00%> (-50.00%)	⬇️
.../manufacturing/report/bom_explorer/bom_explorer.py	94.44% <0.00%> (-5.56%)	⬇️
erpnext/stock/reorder_item.py	74.35% <0.00%> (-3.42%)	⬇️
...t/accounts/report/sales_register/sales_register.py	71.51% <0.00%> (-1.82%)	⬇️
...t/accounts/report/general_ledger/general_ledger.py	59.93% <0.00%> (-1.35%)	⬇️
.../report/stock_projected_qty/stock_projected_qty.py	86.84% <0.00%> (-1.32%)	⬇️
...eport/production_analytics/production_analytics.py	69.51% <0.00%> (-1.22%)	⬇️
... and 20 more