abap - 如何使用REUSE_ALV_FIELDCATALOG_MERGE功能模块？

Question

我正在尝试使用功能模块REUSE_ALV_FIELDCATALOG_MERGE传递ddic中的字段标签以显示在alv报告的列标题中。但是，这不起作用。

如果我注释 I_STRUCTURE_NAME = 'TY_YNAH_CUS_OBJ_REQ' 行，它会给出运行时错误状态

The ABAP program lines are wider than the internal table.

但是如果我取消注释，程序仍然无法运行

REPORT YALV_TEST.

        tables sscrfields. 
        type-pools : slis.

        "CREATE STRUCTURE -1 
        TYPES: BEGIN OF TY_YNAH_CUS_OBJ_REQ, 
               REQID TYPE YNAH_REQ_ID, 
               REQUESTOR TYPE YNAH_REQUESTOR,
               BUSINESS_OWNER TYPE YNAH_BUS_OWN,
               FUNCTIONAL_OWNER TYPE YNAH_FUNC_OWN, 
               REQNUM TYPE YNAH_SERVICE_REQ_NUM, 
               PROJECT_ID TYPE YNAH_PRO_ID, 
               SYSTEM_ID TYPE YNAH_SYS_ID, 
               FUNCTIONAL_AREA TYPE YNAH_FUNC_AREA,
               REQUEST_DATE TYPE YNAH_REQ_DATE,
               REQUEST_TIME TYPE YNAH_REQ_TIME,

           END OF TY_YNAH_CUS_OBJ_REQ.

        "defining internal table -2 

        DATA: IT_YNAH_CUS_OBJ_REQ type TABLE OF TY_YNAH_CUS_OBJ_REQ 
         * WA_YNAH_CUS_OBJ_REQ type TY_YNAH_CUS_OBJ_REQ.

        DATA: it_fcat TYPE slis_t_fieldcat_alv ,
         wa_fcat TYPE slis_fieldcat_alv,
         gd_layout TYPE slis_layout_alv.

        SELECTION-SCREEN BEGIN OF BLOCK menu WITH FRAME TITLE text-001.
        SELECT-OPTIONS: s_proid FOR IT_YNAH_CUS_OBJ_REQ-PROJECT_ID.
        PARAMETER p_sysid type TY_YNAH_CUS_OBJ_REQ-SYSTEM_ID.
        SELECTION-SCREEN: BEGIN OF LINE,
        pushbutton 33(8) BUT user-command search. 
        SELECTION-SCREEN END OF LINE. 
        SELECTION-SCREEN END OF BLOCK menu.

        initialization. 
        BUT = 'SEARCH'. END-OF-SELECTION.

        "execute search function when user click search button
        at selection-screen. "after processing user input 
         case SSCRFIELDS.
           when 'SEARCH'.
            SSCRFIELDS-UCOMM = 'ONLI'.
        endcase.

    "fetch data using select-4 START-OF-SELECTION. 

    SELECT * 
    FROM YNAH_CUS_OBJ_REQ "Database 
    INTO CORRESPONDING FIELDS OF TABLE IT_YNAH_CUS_OBJ_REQ "Into internal table 
    WHERE 
       PROJECT_ID in s_proid and 
       SYSTEM_ID eq p_sysid.

        CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE' 
        EXPORTING
         I_PROGRAM_NAME = sy-repid
        I_INTERNAL_TABNAME ='TY_YNAH_CUS_OBJ_REQ'
        * I_STRUCTURE_NAME = 'TY_YNAH_CUS_OBJ_REQ'
        * I_CLIENT_NEVER_DISPLAY = 'X'
        I_INCLNAME = sy-repid 
        * I_BYPASSING_BUFFER = 'X' 
        * I_BUFFER_ACTIVE = CHANGING CT_FIELDCAT = it_fcat. 
        * EXCEPTIONS 
        * INCONSISTENT_INTERFACE = 1 
        * PROGRAM_ERROR = 2 
        * OTHERS = 3 
        * .
         IF SY-SUBRC <> 0. 
        ** Implement suitable error handling here 
        ENDIF.

Answer 1

1. REUSE_*ALV*不支持功能模块。我建议切换到CL_SALV_*类。文档更好，有更多示例程序 ( DEMO_SALV_* ) 并且您可以获得支持。
2. 如果您想获得基于字典的字段描述，则需要字典结构(废话)。如果您使用TYPE ... BEGIN OF ... END OF ...在ABAP级别组装结构类型据我所知，各个字段的字典类型首先转换为ABAP类型，然后才组装成结构类型。无论如何，原始字段的字典引用丢失了。不要在代码中定义输出表的结构，而是使用字典结构。