Advantage of Alternative UOM as supposed to changing the UOM of material

Hi Friends,
What are the advantages of using alternative unit of measure as supposed to changing the UOM of material? &
what are the necessary activities in SAP if we change the unit of measure of the material?
Any pointers.
Regards
Ashu
Edited by: ashutosh p on Jan 14, 2010 6:29 AM

When you want to handle the material quantity in other units other than it's Base Unit, then alternate unit should be maintained.
Alternate unit is decided on the basis of area of it's usage.
If A material is having base unit PC and you want to sale it in KG then mainain the Sale Unit as KG by providing the conversion between PC and KG.
In the same way Order unit is the unit when you want to procure the material in the unit other than Base unit.
For maintaining alternate unit, it's corresponding conversion with Base unit is necessary to maintain.
You can change the base unit of material unless and untill no transactions are done on that material.

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*& Report ZTEST_S_E
REPORT ZTEST_S_E.
* This code will create a material BoM for the material
* MAINMATERIAL with the components COMPON1 and COMPON2.
* Data Declaration
DATA:
it_bomgroup LIKE bapi1080_bgr_c OCCURS 0 WITH HEADER LINE,
it_variants LIKE bapi1080_bom_c OCCURS 0 WITH HEADER LINE,
it_items LIKE bapi1080_itm_c OCCURS 0 WITH HEADER LINE,
it_matrel LIKE bapi1080_mbm_c OCCURS 0 WITH HEADER LINE,
it_itemas LIKE bapi1080_rel_itm_bom_c OCCURS 0 WITH HEADER LINE,
it_return LIKE bapiret2 OCCURS 0 WITH HEADER LINE.
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* Material BoM Group Header Data
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it_bomgroup-bom_group_identification = 'BAPI_SMP_COL1'.
it_bomgroup-object_type = 'BOM'.
it_bomgroup-object_id = 'SIMPLE1'.
it_bomgroup-bom_usage = '1'. " YOU COULD CHANGE THE BOM USAGE TO YOUR
*NEEDS
it_bomgroup-ltxt_lang = sy-langu.
it_bomgroup-technical_type = ' '.
it_bomgroup-bom_text = 'Simple BoM - FM'.
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* Header Details of the different variants
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it_variants-CHANGE_NO = '500000000349'.
it_variants-bom_group_identification = 'BAPI_SMP_COL1'.
it_variants-object_type = 'BOM'.
it_variants-object_id = 'SIMPLE1'.
it_variants-alternative_bom = '01'.
it_variants-bom_status = '01'.
it_variants-base_qty = '2.000'.
it_variants-valid_from_date = sy-datum.
it_variants-function = 'CHG'.
APPEND it_variants.
* Details of the items of the variants
CLEAR it_items.
it_items-bom_group_identification = 'BAPI_SMP_COL1'.
it_items-object_type = 'ITM'.
it_items-object_id = 'SIMPLE1'.
it_items-item_no = '0010'.
it_items-item_cat = 'L'.
it_items-component = '030790490'.
it_items-comp_qty = '2'.
it_items-valid_from_date = sy-datum.
APPEND it_items.
CLEAR it_items.
it_items-bom_group_identification = 'BAPI_SMP_COL1'.
it_items-object_type = 'ITM'.
it_items-object_id = 'SIMPLE1'.
it_itemas-change_no = '500000000138'.
it_items-item_no = '0020'.
it_items-item_cat = 'L'.
it_items-component = '030790490'.
it_items-comp_qty = '3'.
it_items-valid_from_date = sy-datum.
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it_matrel-bom_group_identification = 'BAPI_SMP_COL1'.
it_matrel-material = '030790490'.
it_matrel-bom_usage = '1'.
it_matrel-alternative_bom = '01'.
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it_itemas-bom_group_identification = 'BAPI_SMP_COL1'.
it_itemas-sub_object_type = 'ITM'.
it_itemas-sub_object_id = 'SIMPLE1'.
it_itemas-super_object_type = 'BOM'.
it_itemas-super_object_id = 'SIMPLE1'.
it_itemas-valid_from_date = sy-datum.
it_itemas-function = 'CHG'.
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CALL FUNCTION 'BAPI_MATERIAL_BOM_GROUP_CREATE'
EXPORTING
all_error = 'X'
TABLES
bomgroup = it_bomgroup
variants = it_variants
items = it_items
materialrelations = it_matrel
itemassignments = it_itemas
return = it_return.
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'.
LOOP AT it_return.
WRITE:/ it_return-type, it_return-id, it_return-number,
it_return-message.
ENDLOOP.
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APP-INV-43141 Error Displayed When Trying To Change The PRIMARY_UNIT_OF_MEASURE (Doc ID 1078914.1)
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https://support.oracle.com/epmos/faces/CommunityDisplay?resultUrl=https%3A%2F%2Fcommunity.oracle.com%2Fthread%2F3535958&resultTitle=How+to+change+primary+UOM+of+newly+created+item+code.&commId=3535958&displayIndex=1&_adf.ctrl-state=vnwgftksh_126&_afrLoop=116529168856235
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Advantage of Alternative UOM as supposed to changing the UOM of material

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