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ABAP 字段类型不一样导致相加之后金额错误

写在前面的总结

1. 如果需要不同底表的字段相加的值，那么最好是根据条件去分别算出那些值放在临时内表里面，再去根据条件读取临时内表，读取完之后取出对应的值进行计算，不然可能会因为字段有不同长度，计算的结果出错
2. 如果要多个表连接，一定要注意连接的条件和思路，思路要清晰，连接条件要正确
3. 在select语句里面如果使用sum函数，字段长度不相等，可能会导致计算出来的值有问题
4. 尽量在select语句的筛选条件里面筛选数据，使得到的内表的行数尽量更少，更准确一些。

原来的代码：

原来的代码：( CASE WHEN c~aufnr IS INITIALTHEN ( SUM( CASE WHEN c~bwart = '102' THEN c~dmbtr * -1 ELSE c~dmbtr END ) )ELSE SUM( CASE WHEN c~bwart = '102' THEN c~dmbtr * -1 ELSE c~dmbtr END ) + d~prd END ) AS dmbtr, "模具入库金额现在修改成：( CASE WHEN c~aufnr IS INITIALTHEN ( SUM( CASE WHEN c~bwart = '102' THEN c~dmbtr * -1 ELSE c~dmbtr END ) )ELSE SUM( CASE WHEN c~bwart = '102' THEN c~dmbtr * -1 ELSE c~dmbtr END ) + ( CASE WHEN abs( d~prd ) > 0 THEN d~prd ELSE 0 END ) END ) AS dmbtr, "模具入库金额

程序名：z_test_lhy2

示例程序1

REPORT z_test_lhy2.
*&--------------------------Variables----------------------------------*
TYPES: BEGIN OF ty_out,werks TYPE mseg-werks,  "工厂matnr2 TYPE mara-matnr, "物料aufnr TYPE mseg-aufnr,  "订单END OF ty_out.
DATA: gs_out TYPE ty_out,gt_out TYPE TABLE OF ty_out.*&------------------------------Logic----------------------------------*
gs_out-werks = '1710'.
gs_out-matnr2 = 'MZ-FG-C990'.
gs_out-aufnr = '000001000920'.
APPEND gs_out TO gt_out.SELECTa~werks,  "工厂a~matnr2, "物料( CASE WHEN b~aufnr IS INITIALTHEN SUM( CASE WHEN b~bwart = '102' THEN b~dmbtr * -1 ELSE  b~dmbtr END  )ELSE SUM( CASE WHEN b~bwart = '102' THEN b~dmbtr * -1 ELSE  b~dmbtr END  ) + c~prd END ) AS dmbtr_hj, "合计金额c~prd,b~aufnr,SUM( CASE WHEN b~bwart = '102' THEN b~dmbtr * -1 ELSE  b~dmbtr END  ) AS dmbtr "原始金额FROM @gt_out AS aLEFT JOIN mseg AS b ON a~werks = b~werks AND a~matnr2 = b~matnrLEFT JOIN mldoc AS c ON b~aufnr = c~aufnr AND c~tcode = 'KO88'WHERE substring( b~budat_mkpf,1,4 ) = '2021'GROUP BY a~werks,a~matnr2,b~aufnr,c~prd,b~aufnrINTO TABLE @DATA(lt_temp).

单独定义两个变量之后再相加，数值是没有问题的，都是正确的：

汇总MSEG表和MLDOC表

这里想先汇总MSEG的金额，再去mldoc表去查询价格差异字段prd，并汇总价格差异的金额，可以用下面的做法：

SELECTa~werks,  "工厂a~matnr2, "物料
*  ( CASE WHEN b~aufnr IS INITIAL
*    THEN SUM( CASE WHEN b~bwart = '102' THEN b~dmbtr * -1 ELSE  b~dmbtr END  )
*    ELSE SUM( CASE WHEN b~bwart = '102' THEN b~dmbtr * -1 ELSE  b~dmbtr END  ) + c~prd END ) AS dmbtr_hj, "合计金额
*  c~prd,b~aufnr,SUM( CASE WHEN b~bwart = '102' THEN b~dmbtr * -1 ELSE  b~dmbtr END  ) AS dmbtr "原始金额FROM @gt_out AS aLEFT JOIN mseg AS b ON a~werks = b~werks AND a~matnr2 = b~matnr AND a~aufnr = b~aufnr"LEFT JOIN mldoc AS c ON a~aufnr = c~aufnr AND c~tcode = 'KO88'WHERE substring( b~budat_mkpf,1,4 ) = '2021'GROUP BY a~werks,a~matnr2,b~aufnrINTO TABLE @DATA(lt_mseg).SORT lt_mseg BY werks matnr2 dmbtr."cl_demo_output=>display( lt_mseg ).SELECTa~werks,"工厂a~matnr2,"物料a~aufnr,  "订单SUM( b~prd ) AS prd "价格差异FROM @lt_mseg AS aLEFT JOIN mldoc AS b ON a~aufnr = b~aufnr AND b~tcode = 'KO88'GROUP BY a~werks,a~matnr2,a~aufnrINTO TABLE @DATA(lt_mldoc).SORT lt_mldoc BY werks matnr2 aufnr."cl_demo_output=>display( lt_mldoc ).