Here are review389951002 which should fix the problem and review378261002 which prevents to set empty string in the product context.

The error will only show when you activate all modules but if you activate only account_rule, the error will not show.

Thank you Cédric

I am using only standard modules. I tried to debug the issue but could not. However, I replicated the same issue in the demo server 6.2 version. Please check sales id 123, the error will show up when you click process.

You seem to have a date key in the context that is not a date but just a string.
Have you any custom module activated?

I am using the Tryton 6.2. I receive the following traceback when clicking on process (Sale).

Thank you.

Traceback (most recent call last):
  File "/usr/local/lib/python39/dist-packages/trytond/wsgipy", line 117, in dispatch_request
    return endpoint(request, **requestview_args)
  File "/usr/local/lib/python39/dist-packages/trytond/protocols/dispatcherpy", line 47, in rpc
    return methodsget(requestrpc_method, _dispatch)(
  File "/usr/local/lib/python39/dist-packages/trytond/wsgipy", line 84, in auth_required
    return wrapped(*args, **kwargs)
  File "/usr/local/lib/python39/dist-packages/trytond/protocols/wrapperspy", line 159, in wrapper
    return func(request, pool, *args, **kwargs)
  File "/usr/local/lib/python39/dist-packages/trytond/protocols/dispatcherpy", line 181, in _dispatch
    result = rpcresult(meth(*c_args, **c_kwargs))
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelviewpy", line 774, in wrapper
    return func(cls, records, *args, **kwargs)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale_shipment_cost/salepy", line 216, in process
    super()process(sales)
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelviewpy", line 774, in wrapper
    return func(cls, records, *args, **kwargs)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale/salepy", line 958, in process
    cls_process_invoice(sales)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale/salepy", line 970, in _process_invoice
    invoice = salecreate_invoice()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale_advance_payment/salepy", line 405, in create_invoice
    invoice = super(Sale, self)create_invoice()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/commission/salepy", line 25, in create_invoice
    invoice = super(Sale, self)create_invoice()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale/salepy", line 794, in create_invoice
    invoice_linesappend(lineget_invoice_line())
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_rule/salepy", line 14, in get_invoice_line
    return super()get_invoice_line()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale_secondary_unit/salepy", line 160, in get_invoice_line
    lines = super()get_invoice_line()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale_shipment_cost/salepy", line 332, in get_invoice_line
    lines = super()get_invoice_line()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale_advance_payment/salepy", line 474, in get_invoice_line
    lines = super(SaleLine, self)get_invoice_line()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/analytic_sale/salepy", line 31, in get_invoice_line
    invoice_lines = super()get_invoice_line()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/commission/salepy", line 87, in get_invoice_line
    lines = super()get_invoice_line()
  File "/usr/local/lib/python39/dist-packages/trytond/modules/sale/salepy", line 1521, in get_invoice_line
    invoice_lineaccount = selfproductaccount_revenue_used
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_product/productpy", line 51, in prop
    return getattr(selftemplate, field_name)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_rule/productpy", line 18, in account_revenue_used
    return super()account_revenue_used
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_product/productpy", line 26, in wrapper
    account = selfget_account(field_name + '_used')
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_product/productpy", line 348, in get_account
    return selfaccount_categoryget_account(name, **pattern)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_rule/productpy", line 47, in get_account
    account = super()get_account(name, **pattern)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_product/productpy", line 192, in get_account
    return selfparentget_account(name, **pattern)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_rule/productpy", line 47, in get_account
    account = super()get_account(name, **pattern)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_product/productpy", line 192, in get_account
    return selfparentget_account(name, **pattern)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_rule/productpy", line 50, in get_account
    account = AccountRuleapply(account)
  File "/usr/local/lib/python39/dist-packages/trytond/modules/account_rule/accountpy", line 109, in apply
    rules = clssearch([
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelsqlpy", line 1442, in search
    tables, expression = cls__search_query(domain, count, query, order)
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelsqlpy", line 1361, in __search_query
    tables, expression = clssearch_domain(domain)
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelsqlpy", line 1571, in search_domain
    expression = convert(domain)
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelsqlpy", line 1567, in convert
    return And((convert(d) for d in (
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelsqlpy", line 1567, in <genexpr>
    return And((convert(d) for d in (
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelsqlpy", line 1565, in convert
    return Or((convert(d) for d in domain[1:]))
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelsqlpy", line 1565, in <genexpr>
    return Or((convert(d) for d in domain[1:]))
  File "/usr/local/lib/python39/dist-packages/trytond/model/modelsqlpy", line 1558, in convert
    expression = fieldconvert_domain(domain, tables, cls)
  File "/usr/local/lib/python39/dist-packages/trytond/model/fields/fieldpy", line 408, in convert_domain
    expression = Operator(column, self_domain_value(operator, value))
  File "/usr/local/lib/python39/dist-packages/trytond/model/fields/fieldpy", line 385, in _domain_value
    return selfsql_format(value)
  File "/usr/local/lib/python39/dist-packages/trytond/model/fields/datepy", line 37, in sql_format
    year, month, day = list(map(int, valuesplit("-", 2)))
ValueError: invalid literal for int() with base 10: ''

Fault: invalid literal for int() with base 10: ''