(1) in ERP, use tcode SM30, view name: MATERIALID, configure an external long material number for material created in MM01：
in my example, it is AAAAA
Once saved, it will be saved in table MATERIALID as below:
(2) download it into CRM:
This is what I observed in tcode SMW01:
Question 1: why I insert an entry in Material Identification including a external material number and then the external number will disappear after I save it.
Answer:
There is a routine to convert the input/output of MATERIALID-MATNR_EXT
When I insert a value in MATERIALID-MATNR_EXT, the input value will be convert to another value according to rules in CONVERSION_EXIT_MATNL_INPUT. In my case, ENHANCEMENT MGV_CONV_EXIT_SAPLOMCV in FM CONVERSION_EXIT_MATNL_INPUT is switched off.
So When I insert aaaa, you can see the input is converted to null.
Question 2: Why I can see external long material number in se11 table Materialid, but cannot see data in view material identification ?
Answer:
The display of external long material number in view "material identification" is converted by routine:
But the ENHANCEMENT 8 MGV_CONV_EXIT_SAPLOMCV in CONVERSION_EXIT_MATNL_OUTPUT is still switched off which is same as in FM CONVERSION_EXIT_MATNL_INPUT. So we just can see null external long material number in view "material identification".
Debug the data extract FM CRS_MATERIAL_EXTRACT in ERP side:
Before extract data from table materialid, two condition must be met:
table mgv_tlmnr is used to activate long material number:
After activate long material number, one entry will generate in table mgv_tlmnr about time.
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