Complete the business code of the purchase order module

[Jzow]

CC #162

[codecov[bot]]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
...wansenai/entities/receipt/ReceiptPurchaseMain.java	0.00% <ø> (ø)
...nai/vo/receipt/purchase/PurchaseOrderDetailVO.java	0.00% <0.00%> (ø)
...ain/java/com/wansenai/utils/response/Response.java	0.00% <0.00%> (ø)
...a/com/wansenai/api/receipt/PurchaseController.java	0.00% <0.00%> (ø)
...ava/com/wansenai/utils/enums/PurchaseCodeEnum.java	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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