1. Tell me What is the Purpose of "Info update" indicator in Purchasing document?

when you create or change the purchase order you can use the info update indicator to define the info record is to be created or updated.
info update(if it is set)
1)the system copies the condition from quotation to the info records
2)the document no from a purchase order or contract release or release order is updated as last purchasing document

2. Explain the MM flow with Tcodes & tables?

Pruchase requistion -> request for quotation ->Creating
Quotation ->price comparision -> purchase
order -> Good receit -> invoice verificatiom -> Payment
me51n->me41->me47->me49->me21n->migo->miro

3. In BoM i mentioned item category as L But when i create po for sub-contracting defaultly it shows T?

Its not your problem, actually from sd people.
go to BOM delete the items and create a new one there

4. Can you explain how to use IDOC/EDI processes in purchasing like PO and in what context?

First set up partner profile with we20
then create master data for condition record MN04 and
select message type EDI
if you don't set up master data then every time while
creating p.o in messages tab you have to select the output
type EDI.Then go to further data tab and select send
immediately to test you settings
to check the status of Idoc you can use the tool we02

5. Where you maintain in material master the multiple units of measures?

IN MATERIAL MASTER, MULTIPLE UNITS OF MEASURE ARE MAINTAINED IN ADDITIONAL DATA UNDER UNITS OF MEASURE TAB

6. In material master do you know any basic tables? What is the difference between MARA and Mark?

Some of tables used in material master and their explanaion.
MAKT-Material Descriptions
MARA- General Material Data
MARD- Storage Location Data for Material
MAST- Material to BOM Link
MVER- Material Consumption
MVKE- Sales Data for Material
MARC- Plant Data for Material

7. What is the basic data required to create PO? What do we maintain in purchase info-record?

Basic data required to create PO is as follows
1. suppier name and address
2. Item description, Unit of Measurement
3. Total PO Quantity Unit rate,
4. Delivery address, payment terms

In purchase Info records information of different suppliers
of the particular item are maintained

8. What is the interaction between SAP MM and SAP ABAP consultant and How does they interact?

SAP MM Consultant & SAP ABAP Consultants interact with each
other mainly for development of smart forms like P.O,
Scheduling aggreement,contract etc as well as for client
specific and non specific reports.

9. We want to change some data like price, data etc in created purchase order. But system is not allowing the same. As a support SAP MM functional consultant what you would do?

There are settings available in release indicator, saying
that, no changes can be applicable once released. If u do
want to do changes, you need to set the release indicator
settings as 'CHANGABLE AFTER RELEASE' option

10. I have created schedule line for one PO that delivery date
for some qty is for eg.20th of dec9.but vendor delivered before that is it possible to post GR? AND actualy why we need to maintain scheduling agreements?

If the Sch.line is created in date format, then GR cannot
be prepared before the scheduled date.

Scheduling agreements is released to vendor only as an qty
indication.

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11. How many stock transport orders available in sap system. And how to configure stock transport orders?

STO is avilable in SAP 3 ways like
1)STO plant to plant use mvt 351
2) STO with delivery use MVT 641 doc type-UB
3)ST) with delivery and billing use MVT type 643 doc type-
NB

configuration steps
1) CREATE CUSTOMER
2) CREATE VENDOR
3)MAINATAIN CUSTERMER AND VENDOR
4) MAINTAIN SALES AREA IN SUPP PLANT
5)MAINTAIN DEL TYPE AND CHECKING RULES
6)MAINTAIN SALES VIEW IN MMR

12. HOW TO CHANGE CONVERSION FACTOR AFTER MADE GRN?

T.code MSC2N can be used to change the conversion factor of
a batch in stock. But be aware that qty in BUOM will remain
unaltered and change in conversion factor will alter the
alternate qty only.

13. What is the difference bet standard & reference purchasing organization?

You have to assign standard purchasing organization to your
specific plants.

but you have to assign std pur. org to reference purchasing
organization to avail conditions and release order's of
reference purchasing organization.

you can assign number of purchasing org. to reference
purchasing organization.

14. Explain Why we use document types in SAP?

In SAP Document Type defines different methods or procedures for a transaction. For Example: Purchase Order is transaction in SAP, but it can be done for different process so there are many document type in ME21N, like standard, framework order, stock transport order, dummy purchase order etc. So in different document type we can perform different type of function for a single transaction.

Likewise above example there are many type of document in GR and IR.

15. which is the movement type in SAP whiihc do not have a reverse Movment type?
E.g. 101 has reverse 102.

121 movement type we can not reverse

16. What is the difference in SAP material management you observed in versions 4.6B and ecc6.0?

VERSION 4.6B does not having all the reports which are in
ECC 6.0.
EXCISE Invoice is not cancelled once it is posted,
that provision is given in ECC6.0.

17. What is the step by step process in MRP?

There is different steps in MRP:
1. Activate MRP in your plant.
2. Create Master Data for MRP (Planning Calender, Quota Setting)
3. Create Material Master with Views like General data 1, Purchasing, MRP1, MRP2, Accounting1.
4. In MRP1 fill the following data (lot size - EX, Reorder Point, Safety stock, Planning Calender etc).
In MRP2 fill the following data (Plan delivery time) and after filling the other views save the materials master.
5. Go to Transaction Code MD03 to run thr MRP.
6. Go to Transaction Code MD04 to view the requirment.

18. Explain cut-over Process in SAP MM?

In cut over activity of MM,

1.Upload the Material Master.
2.Upload the Vendor Master.
3.Upload the Excise Master.
4.Upload the Excise Register.
5.Upload the Open P.O.,Shed. Agreement,Contract,Invoice
Receipt.

19. What is account Modifier in SAP?

It is used in Automatic Account Determination Process.
It is associated with some keys like GBB, KON, PRD. Only this three key have account modifier key, because these key have multiple work to perform.