program with 2 dynamic i_tabs (cl_alv_table_create=>create_dynamic_table)

[Former Member]

Dear Expers

I created a ABAP with dynamic internal table using cl_alv_table_create=>create_dynamic_table more or less according to this example here:

Now I need a second dynamic internal table in the same program. So in a first try I just process the same code a second time (copy+paste) with new variables and new fieldsymbols. But when the program runs and the method is called a second time there is this error: "LT_GENTAB-xyz has laready been declared 7 xyz".

I believe I must free/initialize/delete/undeclare LT_GENTAB before calling the method a second time. Can anybody tell me how to do that? Or is there any other advice on how to create 2 internal tables dynamically in the same program (if possible using the same approach)?

Many thanks

[Former Member]

Dear Expers

I created a ABAP with dynamic internal table using cl_alv_table_create=>create_dynamic_table more or less according to this example here:

Now I need a second dynamic internal table in the same program. So in a first try I just process the same code a second time (copy+paste) with new variables and new fieldsymbols. But when the program runs and the method is called a second time there is this error: "LT_GENTAB-xyz has laready been declared 7 xyz".

I believe I must free/initialize/delete/undeclare LT_GENTAB before calling the method a second time. Can anybody tell me how to do that? Or is there any other advice on how to create 2 internal tables dynamically in the same program (if possible using the same approach)?

Many thanks

[bbalci]

Hi Richard ,

I think you didn't refresh the table LT_GENTAB before your copy code

calling method second time.

Than field XYZ appended into that table again,

a table can not contain two field with same name so you get this error.

Use REFRESH LT_GENTAB.

[Former Member]

Thanks for your reply.

LT_GENTAB is declared and used somewhere in the SAP standard method. Not in my ABAP. I can not access (or REFRESH) this table in my ABAP. Or if there is a way, could you please let me know how?

[bbalci]

Hi,

Here is the sample code from the link in your message :

Filling a table for field declarations :

loop at it_details into wa_details.
  clear wa_it_fldcat.
  wa_it_fldcat-fieldname = wa_details-name .
  wa_it_fldcat-datatype = wa_details-type_kind.
  wa_it_fldcat-inttype = wa_details-type_kind.
  wa_it_fldcat-intlen = wa_details-length.
  wa_it_fldcat-decimals = wa_details-decimals.
  append wa_it_fldcat to it_fldcat .
endloop.

Call the method for dynamic creation :

call method cl_alv_table_create=>create_dynamic_table
             exporting
                it_fieldcatalog = it_fldcat
             importing
                ep_table        = new_table

I meant you didn't refresh table it_fldcat as you fields declaration table.

Did u refresh this table before your second copy code?

[Former Member]

Thank you for your feedback.

I get your point.

Yes, I acctually used new variables, new fieldsymboles and also new fieldcat for the second run.

I assume there must be a method or something like that to "un-declare" the itab LT_GENTAB before I create a second dynamic table.

[Former Member]

Nobody?

[MarcinPciak]

Don't think you have to reinitialize anything. All you need is somethig like

data: new_table type ref to data,
          new_table2 type ref to data.

"fill field catalog here

"create a table first time
call method cl_alv_table_create=>create_dynamic_table
             exporting
                it_fieldcatalog = it_fldcat
             importing
                ep_table        = new_table

assign new_table->* to <tab1>.

"create similar second table 
call method cl_alv_table_create=>create_dynamic_table
             exporting
                it_fieldcatalog = it_fldcat
             importing
                ep_table        = new_table2

assign new_table2->* to <tab2>.

You could use same data reference variable new_table in both cases but in this case you would loose the connection to your first table after executing this method for the second time.

Regards

Marcin