In the process of analyzing data from a source system, you find that there are no reliable amounts that can be used to build a subledger journal entry.How would you resolve this problem?
选项：

A: Use a custom formula in a description rule to derive amounts.
B: Use a custom formula in an account rule to derive amounts.
C: Use a custom formula in a journal line rule to derive amounts.
D: Use a custom formula in a supporting reference to derive amounts.