处理 VA02修改行项目计划行（SCHEDULE LINES ）报错：不可能确定一个消耗帐户
用户修改销售订单行项目 计划行(SCHEDULE LINES) ，从 “CN”改为“CB”时候发生报错提示：不可能确定一个消耗帐户。
Not possible to determine a consumption account
Message No. 06138
Diagnosis
The system was not able to determine a consumption account for the purchase order item with account assignment.
Which account is determined is controlled via Customizing with the function "automatic posting" (transaction/event key GBB).
Procedure
Check your input.
If necessary, contact your system administrator. The latter will be able to specify an account.
Create automatic postings
解决方法：
在 通过跟踪调用函数 ME_ACCOUNT_ASSIGNMENT
最后定位到是这个物料代码的评估类没有设置导致。
设定好评估类后问题解决